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Loading...Eleven snow foam car wash soaps were run through the same battery of tests in a pressure washer foam cannon and a garden hose foam sprayer, spanning a six-fold range in cost per ounce from the 16-cent Meguiar’s Gold Class to the 95-cent Koch Chemie. Each was measured for pH straight from the bottle, for the force needed to slide a weighted sponge across wet paint, and for how long its foam clung to a car door in head-to-head elimination rounds. Cleaning was scored with a colorimeter on a black SUV that had gone a year without a wash: five readings across each taped-off section after two two-minute soaks and rinses, then a second set of readings after a drive down a dusty road.
Sticker price predicted very little, and neither did foam volume. The soap that laid down the most convincing blanket of suds under a pressure washer, the MJJC Snow Foam Shampoo, finished tenth of eleven at removing dirt with a score of 7.50, while Slick Products landed in the top three of every graded category. The cheapest soap in the test also cleaned the least, and the slickest one — the Griot’s Brilliant Finish Snow Foam, at 1.0 lb of sponge drag against 3.3 lb for plain water — was among the weakest at breaking dirt loose.
Best Overall
Best average finish, 1.8
Average Finish: 1.8
Purchased for: $25
Made In: USA
Best average finish of the group at 1.8, and the only soap in the top three of every graded category. Second slickest at 1.3 lb, third for cleaning at 4.79, second for dust resistance at 9.15, and the clear best at removing slung tire shine with a rating of 1.5. Earned the best possible garden hose dwell rating of 1.0. pH 11.06 in the bottle, dosed two to four ounces then topped up with water.
Top three in every graded category: 4.79 cleaning, 9.15 dust, 1.3 lb slickness, and the best tire-shine removal at 1.5.
Best Cleaning Power
Second overall, 2.5
Average Finish: 2.5
Purchased for: $40
Made In: USA
The only soap used at full strength rather than diluted, and by far the strongest base at pH 13.48 straight from the bottle and still 12.71 after the foam cannon. It cleaned best of anything here at 4.35, resisted dust best at 7.86, came second at stripping tire shine, and won the garden hose dwell bracket outright against all ten rivals. Sponge drag 1.6 lb. Second overall at 2.5.
Removed the most dirt at 4.35 and held off the most dust at 7.86. A very strong base at pH 13.48, so rinse thoroughly.
Gentlest On Coatings
Third overall, 3.2
Average Finish: 3.2
Purchased for: $12
Made In: USA
A truck wash formula for heavy dirt and mud, dosed one to three ounces into 32 oz of water. pH 8.42 in the bottle and close to neutral once the cannon dilutes it. Third slickest at 1.5 lb, second best cleaner at 4.63 and 9.71 for dust. Very foamy through both a hose and a pressure washer, though most of it had run off by four minutes. Third overall at 3.2.
Near-neutral once diluted through the cannon, with the second-best cleaning score at 4.63 and 1.5 lb sponge drag.
| Name | Purchased for ($) | Purchased for, Per Piece ($) | Average Finish | Link | Made In | |
|---|---|---|---|---|---|---|
| Slick Products | $25.00 | $0.78 | 1.8 | Search on Amazon | USA | |
Best average finish of the group at 1.8, and the only soap in the top three of every graded category. Second slickest at 1.3 lb, third for cleaning at 4.79, second for dust resistance at 9.15, and the clear best at removing slung tire shine with a rating of 1.5. Earned the best possible garden hose dwell rating of 1.0. pH 11.06 in the bottle, dosed two to four ounces then topped up with water. | ||||||
| Swift Auto Touchless | $40.00 | $0.31 | 2.5 | Search on Amazon | USA | |
The only soap used at full strength rather than diluted, and by far the strongest base at pH 13.48 straight from the bottle and still 12.71 after the foam cannon. It cleaned best of anything here at 4.35, resisted dust best at 7.86, came second at stripping tire shine, and won the garden hose dwell bracket outright against all ten rivals. Sponge drag 1.6 lb. Second overall at 2.5. | ||||||
| Chemical Guys Tough Mudder | $12.00 | $0.75 | 3.2 | Search on Amazon | USA | |
A truck wash formula for heavy dirt and mud, dosed one to three ounces into 32 oz of water. pH 8.42 in the bottle and close to neutral once the cannon dilutes it. Third slickest at 1.5 lb, second best cleaner at 4.63 and 9.71 for dust. Very foamy through both a hose and a pressure washer, though most of it had run off by four minutes. Third overall at 3.2. | ||||||
| Meguiar’s Gold Class | $10.00 | $0.16 | Search on Amazon | USA (globally sourced materials) | ||
$10 for 64 oz, or 16 cents an ounce, the cheapest soap in the group by a wide margin. Mixed five parts water to one part soap, pH 8.40. Cut sponge drag from 3.3 lb with plain water to 2.3 lb. Held foam for the full four minutes under a pressure washer and won the first four rounds of that bracket, but left the most dirt behind of anything tested at 7.74. | ||||||
| P&S Professional | $29.00 | $0.23 | Search on Amazon | USA | ||
A gallon for $29, or 23 cents an ounce, mixed at 80 parts water to one part soap — by far the leanest dilution here. pH 9.23, a mild base. Sponge drag of 2.8 lb was the highest of any soap. Cleaned to 5.69 and finished third for dust resistance at 9.29. Under a pressure washer the foam was gone at 3 minutes 20 seconds. | ||||||
| Adam’s Car Shampoo | $35.00 | $0.27 | Search on Amazon | USA | ||
A concentrated pH-neutral shampoo at 7.55, mixed roughly eight parts water to one part soap, 27 cents an ounce. Tied for slickest of the early group at 2.3 lb and noticeably foamier than the P&S Professional. Cleaned to 5.40 and picked up dust at 9.79. Held the garden hose dwell bracket for three rounds before the Swift Auto overtook it. | ||||||
| Malco | $38.00 | $0.30 | Search on Amazon | USA | ||
A high-foaming formula sold on clinging to the panel, 30 cents an ounce. Label guidance covers wash buckets rather than foam cannons, so the cannon was filled at 1 oz per quart. pH 8.16, sponge drag 2.5 lb, cleaning average 6.28 and dust 9.47. Looked far better through a pressure washer than a garden hose, though the foam was finished at the four-minute mark. | ||||||
| Hybrid Solutions | $20.00 | $0.31 | Search on Amazon | USA | ||
Sold on slick-and-slide polymers, mixed 2 oz of soap into roughly 14 oz of warm water. pH 9.30. Tied with the Swift Auto for slickness at 1.6 lb and laid down a thick blanket of foam. Cleaned to 5.57 but collected dust at 10.09. Led the pressure washer dwell bracket for two rounds until the MJJC Snow Foam Shampoo beat it. | ||||||
| Griot’s Brilliant Finish Snow Foam | $20.00 | $0.42 | Search on Amazon | USA | ||
The slickest soap in the lineup at 1.0 lb to slide the sponge, against 3.3 lb for plain water, and one of three to earn the best possible garden hose dwell rating of 1.0. pH 7.13, mixed eight parts water to one part soap. Foam volume was excellent and it still coated the doors after four minutes under a pressure washer, but it was among the weaker cleaners at 6.66 with dust at 10.69. | ||||||
| MJJC Snow Foam Shampoo | $35.00 | $0.55 | Search on Amazon | |||
Purpose-built for foam cannons and foam guns, mixed nine parts water to one part soap. The most pH-neutral soap here at 6.89. It was the pressure washer dwell champion, earning the best possible rating of 1.0 and beating every brand it faced, yet it cleaned to only 7.50 and picked up dust at 10.75. Sponge drag 2.5 lb. | ||||||
| Koch Chemie Gentle Snow Foam | $32.00 | $0.95 | Search on Amazon | Germany | ||
The most expensive soap per ounce at 95 cents, mixed 2 oz to a quart. pH 7.21, sold as pH neutral yet also labelled corrosive. Foam quality was good and improved markedly with a pressure washer, but sponge drag was 2.6 lb, cleaning was mid-pack at 5.96, and it collected more dust than anything else in the test at 12.60. | ||||||
Lower is better
Prices as purchased. Container sizes are not comparable across the group — a 16 oz bottle of Chemical Guys Tough Mudder sits alongside gallon jugs of P&S Professional, Adam’s Car Shampoo, Malco and Swift Auto — so cost per ounce, charted below, is the like-for-like basis. Dilution ratios vary just as widely, from 80 parts water down to full strength.
Cents per ounce of soap as purchased; lower is cheaper
Cost per ounce of concentrate is not the same as cost per wash, because dilution differs sharply: the P&S Professional mixes 80 parts water to one of soap while the Swift Auto is used neat. The Meguiar’s Gold Class is the cheapest soap on the shelf at 16 cents an ounce and the Koch Chemie the dearest at 95 cents, a six-fold spread.
| Rank | Product | Result |
|---|---|---|
| 1 | Meguiar’s Gold Class | 16 |
| 2 | P&S Professional | 23 |
| 3 | Adam’s Car Shampoo | 27 |
| 4 | Malco | 30 |
| 5 | Swift Auto Touchless | 31 |
| 6 | Hybrid Solutions | 31 |
| 7 | Griot’s Brilliant Finish Snow Foam | 42 |
| 8 | MJJC Snow Foam Shampoo | 55 |
| 9 | Chemical Guys Tough Mudder | 75 |
| 10 | Slick Products | 78 |
| 11 | Koch Chemie Gentle Snow Foam | 95 |
Measured straight from the bottle; 7 is neutral, higher is a stronger base
About a third of the lineup is genuinely pH neutral as advertised, led by the MJJC Snow Foam Shampoo at 6.89, the Griot’s Brilliant Finish Snow Foam at 7.13 and the Koch Chemie at 7.21. The Swift Auto is the outlier at 13.48, and still measures 12.71 after the foam cannon adds water. A strong base can work on wax and ceramic coatings over time, so the two alkaline soaps here reward a thorough rinse.
| Rank | Product | Result |
|---|---|---|
| 1 | MJJC Snow Foam Shampoo | 6.89 |
| 2 | Griot’s Brilliant Finish Snow Foam | 7.13 |
| 3 | Koch Chemie Gentle Snow Foam | 7.21 |
| 4 | Adam’s Car Shampoo | 7.55 |
| 5 | Malco | 8.16 |
| 6 | Meguiar’s Gold Class | 8.40 |
| 7 | Chemical Guys Tough Mudder | 8.42 |
| 8 | P&S Professional | 9.23 |
| 9 | Hybrid Solutions | 9.30 |
| 10 | Slick Products | 11.06 |
| 11 | Swift Auto Touchless | 13.48 |
Pounds of force to slide a weighted sponge across wet paint; lower is slicker
A sponge under 5 lb of load needed 3.3 lb to move on plain water, so every soap in the test added lubrication. The Griot’s Brilliant Finish Snow Foam was slickest at 1.0 lb, a third of the plain-water figure, with Slick Products second at 1.3 lb and Chemical Guys Tough Mudder third at 1.5 lb. The P&S Professional gave up the least, at 2.8 lb.
| Rank | Product | Result |
|---|---|---|
| 1 | Griot’s Brilliant Finish Snow Foam | 1 |
| 2 | Slick Products | 1.30 |
| 3 | Chemical Guys Tough Mudder | 1.50 |
| 4 | Swift Auto Touchless | 1.60 |
| 5 | Hybrid Solutions | 1.60 |
| 6 | Meguiar’s Gold Class | 2.30 |
| 7 | Adam’s Car Shampoo | 2.30 |
| 8 | Malco | 2.50 |
| 9 | MJJC Snow Foam Shampoo | 2.50 |
| 10 | Koch Chemie Gentle Snow Foam | 2.60 |
| 11 | P&S Professional | 2.80 |
| 12 | Plain Water | 3.30 |
Colorimeter reading averaged over five spots after two 2-minute soaks and rinses; lower is cleaner
The colorimeter scores darkness on a 0-to-100 scale, so on this black SUV a lower number means less dirt still clinging to the paint. Clean paint on the same vehicle read 2.18 and an unwashed area read 18.76. The Swift Auto came out on top at 4.35, the Chemical Guys Tough Mudder second at 4.63 and Slick Products third at 4.79, while the Meguiar’s Gold Class trailed the field at 7.74.
| Rank | Product | Result |
|---|---|---|
| 1 | Swift Auto Touchless | 4.35 |
| 2 | Chemical Guys Tough Mudder | 4.63 |
| 3 | Slick Products | 4.79 |
| 4 | Adam’s Car Shampoo | 5.40 |
| 5 | Hybrid Solutions | 5.57 |
| 6 | P&S Professional | 5.69 |
| 7 | Koch Chemie Gentle Snow Foam | 5.96 |
| 8 | Malco | 6.28 |
| 9 | Griot’s Brilliant Finish Snow Foam | 6.66 |
| 10 | MJJC Snow Foam Shampoo | 7.50 |
| 11 | Meguiar’s Gold Class | 7.74 |
| 12 | Untreated Dirty Paint | 18.76 |
Colorimeter reading averaged over five spots after the drive; lower means less dust stuck to the paint
Several of these soaps claim to leave a finish that blocks dirt from sticking. The Swift Auto backed that up best at 7.86, with Slick Products second at 9.15 and P&S Professional third at 9.29. The Koch Chemie collected the most at 12.60, and results here tracked cleaning performance closely rather than foam volume.
| Rank | Product | Result |
|---|---|---|
| 1 | Swift Auto Touchless | 7.86 |
| 2 | Slick Products | 9.15 |
| 3 | P&S Professional | 9.29 |
| 4 | Malco | 9.47 |
| 5 | Chemical Guys Tough Mudder | 9.71 |
| 6 | Adam’s Car Shampoo | 9.79 |
| 7 | Hybrid Solutions | 10.09 |
| 8 | Griot’s Brilliant Finish Snow Foam | 10.69 |
| 9 | MJJC Snow Foam Shampoo | 10.75 |
| 10 | Meguiar’s Gold Class | 10.80 |
| 11 | Koch Chemie Gentle Snow Foam | 12.60 |
Slick Products is the pick for best overall, with the best average finish in the group at 1.8 and a place in the top three of every graded category: third for cleaning at 4.79, second for dust resistance at 9.15, second for slickness at 1.3 lb, and first by a clear margin at stripping slung tire shine with a rating of 1.5. It also took the best possible garden hose dwell rating of 1.0 and was the last soap standing against the MJJC Snow Foam Shampoo under a pressure washer. Its pH of 11.06 is the one caveat, though the foam cannon should bring that down to roughly 10 or below in use, which is unlikely to trouble a wax or ceramic coating. At $25 for 32 oz it is the one to buy.
The Swift Auto finished second at 2.5 and was the outright cleaning champion, averaging 4.35 against 18.76 for the same dirt untreated, and the best at keeping dust off afterwards at 7.86. It was second only to Slick Products at stripping slung tire shine, rated 2.0 for leaving a thin, even film rather than thick pockets. It also won the garden hose dwell bracket outright, outlasting all ten rivals in turn. The catch is pH 13.48 from the bottle and 12.71 even after the cannon dilutes it — a very strong base that wants a careful rinse and some thought before it goes over a coating. The Chemical Guys Tough Mudder took third at 3.2 and is the gentler route to much the same result: pH 8.42 in the bottle and close to neutral once diluted, second-best cleaning at 4.63, and 1.5 lb sponge drag. At 75 cents an ounce it is one of the pricier options per wash.
Two things worth carrying into a purchase. Foam volume and dwell time are poor proxies for cleaning: the MJJC Snow Foam Shampoo was the pressure washer dwell champion with the best possible rating of 1.0 and still cleaned to only 7.50, and the Griot’s Brilliant Finish Snow Foam was the slickest soap here at 1.0 lb yet averaged 6.66. If scratch prevention on a lightly soiled car is the priority, the Griot’s is the one to reach for; if the job is getting a filthy car clean in one pass, buy on the cleaning numbers. And cost per ounce is not cost per wash — the Meguiar’s Gold Class is the cheapest here at 16 cents an ounce and dilutes five to one, but it left the most dirt behind at 7.74, while the P&S Professional at 23 cents an ounce stretches 80 parts water to one part soap and cleaned to 5.69.