The Best Dish Soap
Dishwashing liquid, the kind you squirt into your sink to do dishes by hand, is something that most of us have in our kitchens. After over 60 hours of research we think Seventh Generation Dish Liquid is the one you want. Out of the 20 different hand dishwashing detergents we lab tested, it has the best combination of cleaning power, safety, price, and social responsibility. It also smells good if that’s your thing and comes unscented if it isn’t.
Dawn Ultra is excellent at cleaning, too, and it’s a good pick if you don’t mind dyes, synthetic fragrances, or animal testing. But it and the Seventh Generation are safe, reasonably priced, and will get the job done better than the rest.
What to look for in a dish detergent
First, a dish detergent has to get oil and grease off your dishes. Almost all dish liquids on the market can do this to varying degrees—it’s those degrees that matter. You might also be looking for a detergent that is easier on your conscience and has the fewest worrisome ingredients.
How we picked
There are a fair number of dish detergent guides out there, but there are no great ones. Consumer Reports says that all detergents they tested will get your dishes clean and recommended Ajax because it works well and is cheap. Companies such as Good Housekeeping, America’s Test Kitchen, and Grist compared how well different detergents scrubbed off caked-on grease and food. However, it’s extremely difficult to bake the exact same amount of grease on a number of pans and also make sure you use the same amount of force to scrub it off. In addition, both Good Housekeeping and Grist only looked at ‘green’ detergents, not any conventional ones. They also gave points for how well dish soaps foamed, but that’s not an indicator of how well a detergent can clean (we explain below).
There are also some ingredient guides out there, such as the Environmental Working Group’s (EWG) Guide to Healthy Cleaning, and Good Guide, which are both less than ideal. The EWG often does not give specific reasons for its ratings. For example, they will say things such as “May contain ingredients with potential for respiratory effects; acute aquatic toxicity; cancer,” but do not say what the concerning ingredients are. In addition, they don’t list any sources or link to data. The Good Guide does a better job of breaking down ingredients, but their sources are not great (mostly Wikipedia). Neither outlet tests to see which product works the best.
Lacking a good, comprehensive guide, we decided to do our own tests.
Ajax Super Degreaser Dish Liquid, Lemon – a best buy from both Consumer Reports.
Better Life DISH IT OUT – recently shot up Amazon’s bestseller list, presumably because it was featured on the TV show Shark Tank. This one doesn’t have any of the common cleaning agents that some people are concerned about, and we wanted to see how these compare to more traditional dish liquids.
Biokleen – a common green dish liquid which some people love and others hate. We wanted to form our own opinions.
CitraSolv – This was a bit of a personal pick. I use the brand’s all purpose cleaner and love it; was curious about the dish liquid.
Dawn Direct Foam – winner of Consumer Reports’ tests.
Dawn Platinum Power Clean – recommended by Real Simple. They call it the dish liquid with the most muscle.
Dawn Ultra Dishwashing Liquid, Original Scent, Blue – the classic Dawn; #1 on Amazon’s bestseller list for dish liquids. Also recommended by Cook’s Illustrated.
Dawn Ultra Pure Essentials Dishwashing Liquid (no dyes) – the version of the above without dyes. Wanted to see how it compared with the classic stuff.
Ecover Natural Dishwashing Liquid – one of the top-selling green brands at Amazon; it was Grist’s pick and Consumer Reports’ green pick.
GrabGreen in Red Pear with Magnolia – this and another dish liquid were in a tie for best fragrance from Real Simple.
Ivory Ultra Classic Scent – fared well in Consumer Reports’ tests.
Joy Ultra Concentrated – fared well in Consumer Reports’ tests.
Method, clementine – Method offers refills, so you don’t have to buy a whole new bottle when you want more. And according to Amazon, people really love the way this stuff smells in a variety of fragrances. Clementine seemed to be the most popular, so that’s what we went with.
Mrs. Meyer’s Clean Day Dish Soap, Lemon Verbena Scent – ditto on the cult following for fragrance on this one, plus also a popular green dish liquid.
Original Palmolive Ultra – the classic for no more dishpan hands! Thanks, Madge. This brand has been around for ages, and we wanted to see how one of the grandpa detergents measured up.
Palmolive OxyPlus – version of above but with OxyClean, a bleach alternative. Wanted to see how it compared to the regular version.
Planet Ultra – Good Housekeeping pick for green dish liquids, and on the top of the Good Guide’s list.
Seventh Generation Dish Liquid – the bestselling green dish liquid according to Amazon, and a strong #3 overall. Also highly recommended by Cook’s Illustrated, and Real Simple’s pick for gentlest on skin.
Up & Up fresh scent (Target store brand) – we wanted to test a generic brand along with the others, and this is what I had in my cabinet. Plus it says on the bottle, “Compare to Dawn Ultra!” So we did.
Things we dismissed
We did not test any dish liquids that were labeled as antibacterial, since they contain triclosan. I go into more detail below, but the FDA isn’t sure that antibacterials actually help get rid of germs, and they might be hurting our health. We also didn’t test the different fragrances of the same type of detergent, since we assumed that these would have the same basic formula and performance. (Fragrances don’t have any role in the chemistry that gets our dishes clean.) One exception to this was comparing Original Dawn to Dawn Pure Essentials, since they have slightly different formulas. We also didn’t test a Dawn non-ultra variety, since the company’s PR person told me that they “weren’t supporting the brand” any more, and you can only get those at Dollar General stores. (Although you can still get that at Amazon, you mightn’t be able to for much longer.)
How we tested
When setting up a testing method, we ran into two problems. As I mentioned above, it’s difficult to bake on a set amount of grease to a dish or pan. Second, short of building a scrubbing robot, it’s also hard to wash a dish with the same amount of pressure and strokes each time. So that makes the most obvious test—just washing some dirty dishes—not really work. Instead, we listened to surfactant expert Brian Grady, the director of the Institute for Applied Surfactant Research at the University of Oklahoma. Surfactants, short for surface active agents, are the soap-like molecules in cleaning products that bind oil and water together so they can be washed away. (For more details on how, see our explainer below.)
This method works in a couple of ways. It measures how the detergent by itself can work to clean away oil, which is the point of a dish detergent. It also leaves out the scrubbing factor, which might tend to make people think that their detergent is working harder than it is. Because really, if you scrub hard enough with any detergent, your dish will come clean. However, since I was eyeballing the remaining oil, and not using a machine to tell me precisely how much food coloring was left behind, I had to put the detergents into relative categories.
The categories: excellent (5-10% oil remaining), very very good (10-15% oil left), very good (15%), good (20%), okay (25%), and poor (35%). For reference, the control had about 40% of the oil left on the plate.
What we found
There were two clear winners in the cleaning tests: Seventh Generation and Dawn. Both of these detergents topped the pack, and we categorized them as excellent. As I said above, Seventh Generation is our ultimate pick because the company doesn’t use dyes or synthetic fragrances that may contain potentially harmful compounds, and it doesn’t test on animals. But Dawn works great, too. And both are reasonably priced. Depending on what your priorities are, either is a great pick.
However, the runners-up were not far behind. The following detergents fell into the very very good category: Dawn Ultra Pure Essentials Dishwashing Liquid (no dye)2, Joy Ultra Concentrated, Planet Ultra, Citri-solv, and Dawn Direct Foam. These were also good cleaners, and you honestly probably couldn’t go wrong with any of these either, especially if one has a scent that you particularly love. (Personally, I kind of want to spread the Citri-solv behind my ears for perfume.) The Dawn Direct Foam also deserves a special mention because it’s meant to be applied directly to your sponge instead of squirted in the water. I tried doing some oily dishes this way too, and the foam actually lasted quite a while. As a result, you could potentially use A LOT less water if you do your dishes with this.
Long-term test notes
Senior Editor Ganda Suthivarakom has been using the Seventh Generation liquid soap for six months and loves it. Prior to switching to our pick, she used Dawn in her kitchen for many, many years. The Seventh Generation liquid has a great viscosity and, unlike a lot of so-called “green” soaps, it matches Dawn’s grease scrubbing power—a little goes a long way. She finds that the big difference between the two is that Seventh Generation rinses more easily from the sponge and dishes, pretty much eliminating disgusting mildewy sponge smell. For her, that’s reason enough to make a permanent switch to Seventh Generation.
How to do dishes
I tested dish liquids in room temperature water and put the detergent in the water after the sink was filled. (Remember, suds aren’t an indicator of cleaning power.3) Right about now, you may be wondering if you’ve been doing your dishes wrong for years. Don’t worry. I asked Grady-the-surfactant-man and both Dawn and Seventh Generation if there is a preferred way to do dishes. Grady says that which order you add detergent and water doesn’t really matter, as long as the detergent is mixed into the water well. “In theory less foam is better,” he says, “but the effect is so small as to be negligible.”4 But adding the detergent first does help with getting it evenly distributed. Grady says that he adds detergent just before turning off the tap. Soaking also helps, but about five minutes is long enough in most cases.
Both Dawn and Seventh Generation said that customers should do dishes in a way that works best for them, and that they don’t have any specific recommendations. So basically, you could do your dishes naked with sardines in your ears5, as long as you use their product.
At home, temperature does not matter too much. Hot water will help dissolve grease better, but it won’t kill bacteria on your plates. According to the FDA’s rules for restaurants (pdf), you need the water to be around 171°F to sanitize dishes. That’s really hot.6 Most people can only stand water temperatures around 110°F, and most people keep their home hot water heaters set at around 135°F or so. So washing your dishes in really hot water at home won’t do much if you want to kill bacteria. For restaurants, the FDA requires that employees wash dishes in 110°F water, rinse well, then submerge the dishes for at least 30 seconds in a sanitizer solution. According to a study from a few years ago, washing your dishes in cooler water than 110°F will still kill bacteria, as long as you soak them in a sanitizer afterwards. Bleach works, and you don’t need much. A tablespoon in a gallon of water is the MAXIMUM that the FDA allows for surfaces that will touch food (pdf), and a teaspoon in a gallon of water is probably enough. Let dry completely before using the dishes, or rinse them off with clean water after sanitizing. But if you don’t want to use a sanitizer, you can minimize the amount of bacteria on your dishes by washing them as soon as possible after use. Bacteria tends to cling to the tines of forks and plastic dishes, so give these special attention.
Are ‘green’ dish detergents really green?
According to some data gathered for me by Professor Jennifer Field, an environmental and molecular toxicologist at Oregon State University, the main surfactants in dish detergents, sodium lauryl sulfate (SLS) and sodium lauryl ethyl sulfate (SLES) (more about these here), both decompose in sewage treatment plants and soil (where your wastewater ends up if you have a septic system). In addition, once they’re in the soil, they don’t move to other places. As such, these compounds aren’t a hazard to the environment. However, dumping ANY soap directly into a water system is a bad idea, regardless of which surfactant is in the bottle. All of them will kill fish.
I go into more detail below, but dish detergents have little to no phosphate, a potential water pollutant these days. So that’s out as an environmental hazard.
How much does this matter? Well, it’s unclear. I can’t find any scientific studies on the environmental impact of oil-based versus plant-based detergents. Companies that sell ‘green’ detergents say it does matter, but they want to sell their detergents. According to the American Cleaning Institute, a group made up of companies that make cleaning products and their raw ingredients, there are environmental tradeoffs to using both renewable and non-renewable sources for cleaning products, so it tends to even out. They say, while plant-based cleaning agents “are derived from a renewable resource, they typically produce more air emissions and solid waste. Petrochemical surfactants, on the other hand, consume more total energy, since they are made from resources used as energy.” Unfortunately, they do not link to a source for this research.
Making this even more complicated is an interesting experiment run by Rebecca over at greenbabyguide.com. In her quest to find the best dish detergent, she tested a number of different brands over a year in her kitchen. She found that with green detergents, she tended to have to use more to get her dishes clean. Because of this, she tended to use the bottle up faster, which created more plastic bottle waste and cost her more money. She found that based on how long it lasted, using Biokleen green dish detergent would cost her four times as much than the generic brand, and produce about six more empty bottles per year.
So is it worth it to buy ‘green’ dish detergent? The answer is a bit hazy. Based on everything I could find, it’s unlikely to have much of an impact, if any.
However, there is one difference that may be important: ‘green’ dish detergents tend not to test their products on animals. I don’t think this falls under an environmentally-friendly heading, per se, but I do consider it a plus. So that earns points for our ultimate top pick, Seventh Generation.
Surfactants and a potentially hazardous byproduct
There are two main surfactants that most companies put in their dish liquid, sodium lauryl sulfate (SLS) and sodium lauryl ethyl sulfate (SLES). As you can probably tell by their names, the two are very closely related. They have similar properties, too. SLS cleans a bit better and is foamier, but is also more likely to form soap scum and is more irritating to skin.9 SLES, also known as sodium laureth sulfate, is just SLS transformed into a compound that doesn’t cause soap scum. Chemists create SLES through a process called ethoxylation, which is basically just adding chemical fragments called ethoxy groups to the grease-loving part of the surfactant molecule. This makes the surfactant less likely to interact with the dissolved minerals in tap water, thus producing less soap scum.
When you make SLES from SLS, the reaction creates a small amount of a compound called 1,4-dioxane. Manufacturers can remove this contaminant from surfactants through a process called vacuum stripping, but amounts of it can still end up in the finished bottle of detergent. And because it’s a contaminant and not an ingredient, detergent companies aren’t required to say on the label that it’s in there.10
1,4-dioxane is described by the EPA as a probable human carcinogen. This means that there aren’t any definitive tests on humans, but the compound has caused cancer in lab animals at high concentrations. Scientists also know that 1,4-dioxane can be absorbed through the skin, although it’s more likely to cause harm if inhaled.
Now the important thing to remember here (and with all chemical exposure) is that the dose makes the poison. No compound is toxic in and of itself; how much a person is exposed to is what’s important. For example, the toxic dose of a chemical such as arsenic is much much lower than the toxic dose of a chemical such as water.11 But let’s get to the question that people are worried about.
Will 1,4-dioxane in dish detergent harm me?
Quick answer for those who don’t want to read this whole section: it’s incredibly unlikely.
In summary, it seems the popular limit for 1,4-dioxane is 10 ppm. And that’s for products that you ingest or otherwise put inside your body. There aren’t any guidelines for 1,4-dioxane levels in cosmetics or cleaning products right now, but the FDA has done some skin absorption studies. They found that 1,4-dioxane can be absorbed in the skin in certain cases, such as when it’s found in lotion. However, they found that the compound evaporates really fast, which means that a very small amount makes it into the skin, even when these products remain on the skin for hours. Since there’s a very small amount found in products such as lotions to begin with, only a very very small amount might actually be absorbed.
In short: the FDA is not really worried about it. They are monitoring it, though, and they advise manufacturers on minimizing the amount of 1,4-dioxane in their products.
Let’s get back to dish detergent. Most conventional dish detergents, such as Dawn, Ajax, and the like, use both SLES and SLS in their detergent formulations. And most ‘green’ detergents, such as Seventh Generation, Ecover, and Mrs. Meyer’s Clean Day, use only SLS. Remember, 1,4-dioxane is more likely to be in products that contain SLES.12
In 2008 and 2009, the Organic Consumers Association tested a bunch of different shampoos, body washes, and dish detergents for 1,4-dioxane.13 The products they tested were by no means extensive, but they did look at several different dish detergents.14 Many ‘green’ dish detergents tested had levels of 1,4-dioxane around 100 ppm or so, but the manufacturers got these down to non-detectable amounts (below 0.2 ppm) when they were retested a year later. For the dish detergents they tested that had a detectable amount of 1,4-dioxane, the average amount was just below 3 ppm, and number is skewed high by the 8.6 ppm reading of the Palmolive Pure & Clear Sparkling Fresh. Everything else was below 3 ppm, well below the popular limit.15
Remember how much dish detergent you use when you’re doing dishes? About a teaspoon in a sink full of water. I decided to find out if this amount of 1,4-dioxane when washing dishes is enough to register any concern.
I have a pretty standard size sink in my house. I filled one side up with the amount of hot water I’d typically use to do a load of dishes, and it came out to about 2.6 gallons, or 10 liters (L). It took one teaspoon, or 5 milliliters (mL), of Target’s generic brand to produce about three inches of foam on top, about how much I’d use if I were doing a load of dishes. I want to get the amount of detergent in water into ppm so I can directly compare it to the limits the government agencies put on it, so I’ll need the weight per volume of the detergent. Different brands vary a tiny bit, but it’s about 1 gram (g) per mL, the same as water.16
Since ppm is mg/L, we can say that this concentration of detergent in water is 500 ppm. Because I don’t know the concentration of 1,4-dioxane in this detergent, I’m going to use a high estimate of 10 ppm, based on the findings by the OCA. For simplicity’s sake, I’m going to write out ppm as a fraction. That’s 10 molecules of 1,4-dioxane in every 1 million molecules of detergent, which looks like this:
The last number on the bottom is a billion. That makes 5 parts per billion of 1,4-dioxane in a sinkful of water. Not much.17 You would need to do about 2,000 sinkfuls of dishes and absorb all of it into your skin to get to the 10 ppm level. However, if you’re still concerned about it, avoid dish detergents with any ingredients containing the –eth suffix, plus PEG, which stands for polyethylene glycol. And if that’s not enough, you could don a pair of classic yellow rubber gloves to do your dishes. As a bonus, you would avoid dishpan hands. Win.
Other ingredients of concern
Our first concerns: phthalates—a class of chemicals known as plasticizers, which make hard plastics more flexible and therefore harder to break. Phthalates are found in hundreds of different products. You may have heard about them because there’s been some recent press about getting phthalates phased out of use in children’s toys. How exactly they affect human health, if at all, is not clear. They have caused harm to the reproductive systems of lab animals, but there haven’t been many human studies. CDC researchers have found phthalates (or metabolites) in many people they tested, leading them to say that exposure is “widespread.” The FDA says that they don’t pose a safety risk the way they’re used in cosmetics right now, but they’re keeping an eye on it.
In dish detergent, phthalates tend to be used in the fragrance mixture. But you won’t see anything that looks like a phthalate on the outside of a dish detergent bottle—per FDA rules, companies are not required to list the ingredients of a fragrance. However, choosing ‘fragrance-free’ dish detergent will probably help you steer clear of this one. And many detergents such as Seventh Generation that don’t use phthalates tend to advertise that on the label.
Another compound to look out for is triclosan. It’s used as an antibacterial agent in many products, including dish detergent. And because it’s also used as a pesticide, this one is required to be on the label. As I mentioned above, the FDA says antibacterial soaps with triclosan do NOT work better than regular soap. There isn’t any evidence that they kill more germs than regular old soap, and some studies say that the use of this compound is leading to more resistant bacteria. You’ve probably heard of these superbugs, and they have the potential to make us really, really sick.18 In addition, scientists have found that people with triclosan in their noses, which can get in through ingestion or skin exposure, are more likely to have staph germs up there too. In response to these types of data, the FDA recently gave companies that make antibacterial soap a year to prove that it’s beneficial. Not wanting to wait for this info, Minnesota has banned products with triclosan from being sold in the state, and New York is considering similar bills. So maybe skip anything that says ‘antibacterial’ on the label. Because of this, we didn’t test any of these types of dish detergent.
It used to be a problem, but in August 2010 seventeen states passed a ban on high amounts of phosphates in lawn fertilizers and dish detergent (which includes handwashing dish liquid). Because of the nightmarish logistics that would go along with having phosphate containing detergent in some states but not others, companies just cut back on the amount of phosphate in all their products. More recently, Procter & Gamble, who makes Dawn and Tide, said that they’re going to cut back on phosphates in their products worldwide, phasing them out completely over the next two years. As such, it’s unlikely that your dish detergent contains phosphates. To be sure, check the label.
How soap works
Why do we need to use soap on our dishes at all? Because oil and water don’t mix. Water molecules are made up of an oxygen atom with two hydrogen atoms on either side (H₂0). The elements stick together because they share little electrical charges knowns as electrons. Oxygen’s a bigger electron hog than hydrogen and pulls the electrical charge towards it, away from the hydrogens. Because of this unequal electron sharing, the water molecule has one part with a slightly negative charge (the oxygen) and another charged slightly positive (the hydrogens).
Oil, on the other hand, is mostly made up of carbon and hydrogen atoms. These are much better at sharing their electrons evenly, and as a result don’t have an overall electrical charge.
When you get oil and water together, both liquids bead up and try to minimize their contact with each other. The charged bits repel the non-charged bits, and vice-versa. Both liquids kind of fold up into themselves to try to minimize contact with one another. It is for this reason that you can rinse a plate gunked up with grease all day long, and while some might sloosh off just from the blast of water, to get it really clean you need a way to make the two different molecules mix. That’s soap.
Soap is pretty dang nifty. It’s made up of two opposite parts: one part that’s neutral so it can mix with oil, and one part that’s charged so it can mix with water. It looks like this:
When soap molecules encounter a blob of grease in water, the neutral parts interact with the oil while the charged parts interact with the water. It ends up forming a structure called a micelle,19 which is kind of a spherical20 blob. It looks like this:
The heads of the soap molecules point out, towards the water. And the tails point inward, towards the soap. By pulling the grease and water together, the soap allows water to dissolve the grease, which allows us to rinse it away. Victory!
Dish detergent isn’t technically soap
Though we call it soap, chemists call it sodium stearate. The trouble is, sodium stearate actually isn’t that great at cleaning. It often reacts with the dissolved minerals in tap water to form a white solid. It’s this solid that sticks to the walls of your shower and the sides of your wine glass, otherwise known as soap scum. When a molecule of soap forms a molecule of soap scum, that’s one fewer molecule that can form the micelles around grease, so it not only mucks up dishware and tiles, but it does not clean as well.
To get around the soap scum problem, scientists developed other soap-like molecules that don’t form scum as readily, because they don’t react as well with the types of minerals typically found in water. These are surfactants, short for surface active agent.
Surfactants are in all types of cleaning products from toothpaste to shampoos to dish detergents. A detergent, ultimately, is a cleaning solution that contains one or more surfactants. According to surfactant expert Brian Grady, detergent companies put a combination of surfactants into detergents for foaming, cleaning, and not producing soap scum. They also put the smallest amount of surfactant in the bottle possible—they’re trying to make the detergent clean well and cheaply. Also, soaps and detergents tend to be irritants—all surfactants are designed to make oil rinse away in water, which includes the oils in your skin, so they can make your skin dry and itchy. Some soaps and detergents also are alkaline, so they might produce a burning sensation if you’re sensitive.21
By the way, dish soap works on seemingly low-grease foods. For example, even a vegetable like a dry-roasted pepper contains a ton of natural oils. And burnt-on sugar is not all that molecularly different than oil; it’s mainly hydrocarbons, which are dissolved by the hydrophilic part of soap.
Perusing liquid dish detergents on Amazon brings up a few dish detergents that are marketed specially towards baby items, such as bottles, breast pump parts, and toys. But are these really any different from regular dish liquids? The three most prevalent baby targeted brands are Palmolive, Seventh Generation, and Dapple. Palmolive Baby has fewer ingredients than the original Palmolive dish liquid, and uses a different main surfactant.22 The baby variety also has three surfactants instead of two, and a pH control agent instead of stabilizers to help keep it fresh. The only problem with the Palmolive Baby dish liquid is that many people complain about the residual fragrance (according to reviews on Amazon, soap.com, and drugstore.com). Palmolive doesn’t make a fragrance-free baby dish liquid at the time of this writing.
Dapple, which only makes baby-marketed products, also has a dish liquid. Dapple Baby comes in a fragrance-free variety, and does not contain any SLS or SLES, instead using lauryl glucoside23 as a cleaning agent. The bottle promotes “baby-safe ingredients” and has a sticker on the bottle that claims “0% toxins.” This seems to imply that other dishwashing detergents are not baby-safe, and that Dapple is harmless, neither of which are true. Using the word “toxins” is also a bit strange, since the definition of a toxin is a biologically produced poison, like a snake venom or the compound that causes botulism. When I pointed this out to the company, their representative, Kelsey O’Connor, told me that they mean that the detergent has the following attributes: it contains no SLS, no SLES, no parabens, no 1,4-dioxane, no dyes, no artificial fragrances, no phthalates, and the bottles are BPA-Free. I again pointed out that none of these things are toxins, and while saying the detergent has 0% toxins is technically true24 this might mislead customers to think that the ingredients are harmless, which is not true, and surely they don’t mean to mislead their customers? This was Dapple’s official response:
“The claim “no toxins” is completely true and forthright – not a single ingredient in our products is a toxin, and we disclose all ingredients to make sure everyone knows exactly what’s in there. The fact that something does not contain toxins, however, does not necessarily mean it is edible. As a result, we also clearly mark all products with a safety warning to that end.”
So there you go, folks. Dapple is your source for officially botulism-free dish liquid.
Deadly nerve toxins aside, do you really need a separate dish liquid for washing baby bottles and breast pump parts? We decided to do our own tests to find out. I followed the same protocol for the regular detergents: put a thin layer of oil on a plate, then submerge it in 10 L of 70°F water with 5 mL of detergent mixed in, and beat it with an egg beater for two minutes. Then I compared the baby detergents to water, the regular Seventh Generation, and Dawn. And guess what? Both Palmolive baby and Dapple removed more oil than the regular Seventh Generation and Dawn. Dapple was the best, leaving only about 5% of the oil on the plate. Palmolive baby left behind about 10% of the oil. Seventh Generation baby did not do as well, and left about 25% of the oil on the plate, a worse performance than the regular Seventh Generation dish liquid.
But are these detergents worth it? Reviews from multiple sources sing the praises of these dish liquids, but they are more expensive. Dapple rings up at about $0.26 per ounce (although through that source you do have to pay shipping). The price of the Palmolive Baby seems to be all over the place online, but I got a 10 ounce bottle for $2.50 at my local Wal-Mart. At that price, it might be worth it to keep some for bottles and breast pump parts. But I would try out regular detergents first. If they don’t work for you, then maybe it’s time to bring in the big guns.
Wrapping it up
You can’t beat the cleaning power of Seventh Generation, and it comes with a side of social responsibility. And for just the main course, Dawn Ultra is also a good pick.
Dishwashing liquids: A foam outperformed the competition, Consumer Reports, February 2009
The Best Green Cleaners, Good Housekeeping
The Best Dish Soap for Your Home, Real Simple, November 2012,
Liquid Dish Detergent, Cook's Illustrated, February 2012