Koch-Chemie Gentle Snow Foam "Gsf" Cleaning Foam 1000ml

pH-neutral pre-wash with Koch-Chemie Gentle Snow Foam

What is Koch-Chemie Gentle Snow Foam? A pH-neutral cleaning foam for contactless pre-washing that creates a thick, long-lasting foam layer on the paint surface – compatible with waxes and sealants. Not suitable for baked-on insects or tar, for which active cleaners are available.

Koch-Chemie Gentle Snow Foam is a pH-neutral pre-wash foam from Koch-Chemie in Unna, which works at a pH value of around 7.5 and is applied with a foam lance or foam sprayer. The dense foam carpet gently softens loose road dust and pollen before hand washing – without attacking wax layers or ceramic coatings. This makes GSF the standard for weekly maintenance.

• pH-neutral at around 7.5. Does not attack carnauba wax, polymer, or ceramic sealants. You can use GSF every week without reducing the durability of your GYEON Q² MOHS or Koch-Chemie 1K Nano – unlike active foams with a pH of 11 or higher.
• Dense foam carpet with long dwell time. At a 1:50 ratio in the foam lance, it forms a creamy foam that adheres to vertical surfaces for 4–6 minutes, instead of running off immediately. The dwell time is sufficient to bind loose particles and carry them away when rinsed – this is the purpose of the pre-wash.
• Economical and dual-use. 1 liter is enough for approx. 50 pre-washes with a 20 ml dosage – about €0.26 per application. Alternatively, it can be used as a hand wash shampoo: 50 ml per 10 liters of water in a bucket, done.

Practical tip from Detailing1: Foam consistency depends on the amount of water in the lance, not the amount of product. If you add more GSF but use too little water, you'll get thin foam instead of a creamy carpet. Rule of thumb: Fill the mixing container two-thirds with warm water, then dose 20 ml per liter. For soft water under 8 °dH, slightly increase the dose; for hard water above 14 °dH, reduce it – otherwise, you'll get tough foam that's difficult to rinse off.

And always work on wet, pre-rinsed paint surfaces. Dry paint means the foam rubs loose sand particles into the material – the most common beginner's mistake.

Foam lance, 20 ml, let the foam run off

Apply GSF to the wet, pre-rinsed vehicle – never to dry paint, otherwise you'll rub loose sand over the surface when rinsing. First, remove coarse dirt, insects, and bird droppings with a high-pressure cleaner. A quick pre-pre-wash with clear water takes 30 seconds and saves the clear coat from unnecessary micro-scratches.

Put 20 ml of GSF into the foam lance for every 1 liter of water, which corresponds to about 1:50. Apply the foam from bottom to top, so that run-off marks don't create clean streaks in the dirt. Let it dwell for 4–6 minutes, shorter in direct sunlight – the foam must not dry, otherwise it will leave streaks.

Then rinse thoroughly with clear water from top to bottom. Foam residues in panel gaps indicate insufficient water pressure or too short a rinsing time. What remains on the paint now belongs to the car shampoo step of the two-bucket wash. The pre-wash does not replace shampoo; it only reduces the amount of particles in the wash mitt.

If you don't have a foam lance for your high-pressure cleaner, you can apply GSF with a pump sprayer – however, the foam will be significantly flatter and won't last as long. For manual bucket washing, dose 50 ml per 10 liters of water, which is about two pumps from a commercial bottle. The foam will then comfortably suffice for a medium-sized vehicle, from a Golf to an E-Class.

pH-neutral means: your coating remains intact

The most important difference to active pre-wash foams like Koch-Chemie Green Star is the pH value. GSF is around 7.5, Green Star around 11. On an uncoated paint, this doesn't matter, but on a ceramic sealant, it does.

Studies and practical tests show that highly alkaline cleaners above pH 10 degrade the topcoat layer of ceramic sealants measurably faster. If you want to get 12 or 24 months of durability from your sealant, pH-neutral weekly washing is better. GSF is designed precisely for this – long-term care instead of one-time deep cleaning. The hydrophobic effect of the sealant is maintained, and water beads off after washing just like on day one.

Where GSF reaches its limits: It won't remove baked-on insects on the front, tar spots on the sills, brake dust on rims, or hardened pollen. For these, specialized products are used – insect removers, tar removers, or rim cleaners.

If the vehicle is heavily soiled and you want to turn GSF into an active foam, add 10–30 ml of Green Star to 1 liter of the finished foam mixture in the lance. This shifts the pH value upwards and gives the foam more power – but on coating-sealed vehicles, only as an exception, not as a weekly routine.

For sealed vehicles and honest limits

GSF is suitable for anyone who regularly washes their sealed or waxed vehicle. The logic is simple: regular gentle cleaning instead of aggressive scrubbing rarely. Those who make washing a firm weekly routine will get the most out of GSF.

It is less suitable for workshops, seasonal vehicles after a long period of inactivity, or spring cleaning after winter – in these cases, active foams with a higher pH are superior because the contamination goes far beyond what GSF can dissolve. Also, those who don't own a foam lance but only use a pump spray bottle will get foam with GSF, but never the consistency and dwell time of a proper lance on a high-pressure cleaner. In this case, a pre-cleaner applied by spraying is more worthwhile.

The 1-liter bottle is enough for about 50 washes, the 5-liter canister for 250 washes. Anyone who maintains more than one vehicle or works in a detailing studio will save about 30 percent per application with the 5-liter container. Combined with a pH-neutral shampoo like Koch-Chemie Nanomagic Shampoo or GYEON Q² Bathe+ for the two-bucket wash and a drying towel for finishing, you have the complete weekly workflow for a well-maintained vehicle – from the first jet of water to the last drop, without attacking your sealant.

The characteristic cherry scent is a matter of taste, but rarely polarizing – most detailers find it significantly more pleasant than the soapy standard smell of many competitor products. In closed garages or wash halls, the smell does not linger after rinsing, which is a practical detail in daily workshop operation.

When using GSF for the first time, do not be too sparing with the dosage. 20 ml per liter is the lower limit for a visible foam layer. For heavily soiled vehicles or hard tap water, it may be a pump fill more. The additional cost of 4–5 cents per wash is negligible compared to a weaker result.

The same applies to the water pressure of the high-pressure cleaner: below 100 bar, the foam structure remains thin; from 130 bar, it becomes creamy and adheres firmly to the paint. If you are working with a Kärcher K7 or comparable device, you can turn the lance to maximum foam throughput. With mobile battery-powered cleaners, the foam will be noticeably flatter – not a product defect, but a matter of pressure.

A supplementary recommendation from Detailing1's practice: replace GSF with an active foam wash with Green Star before every seasonal wash in spring and autumn. This prevents pollen film and winter salt from setting in, which the pH-neutral foam can no longer dissolve in the long run. For the remaining 50 weeks of the year, GSF runs as standard.

Anyone who consistently follows this routine will still have visible water beads even on a 5-year-old coating – and that is precisely what pH-neutral care is about: substance preservation instead of constant reapplication of the sealant. The more expensive step in the detailing budget is always the sealant itself, not the shampoo. With GSF, you extend the lifespan of the coating – with minimal running costs and maximum compatibility.

Application of Koch-Chemie Gentle Snow Foam

Pre-wash with foam lance in four steps

First, thoroughly wet the vehicle with a high-pressure cleaner and rinse off coarse dirt, loose insects, and bird droppings. Vehicles left directly in the sun should be cooled with clear water beforehand—hot paint will cause the foam to dry before it can work effectively.

Mix 20 ml of Gsf with 1 liter of water in the foam lance's mixing container—for a 1-liter lance, this is approximately two pump fills. Fill two-thirds of the container with warm tap water, then add the Gsf and close the lid. Shake lightly before screwing on the lance to mix the foam and water.

Apply foam to the wet vehicle from bottom to top. Start with the wheels and sills, then doors and hood, and finally the roof. This prevents foam streaks from running onto areas that have already dried. After an exposure time of 4–6 minutes in shade and at moderate temperatures, or 2–3 minutes in warm weather, rinse thoroughly from top to bottom with clear water. This is followed by a two-bucket wash with pH-neutral shampoo—the pre-wash only reduces the particle load, it does not replace shampoo.

For hand washing, mix 50 ml of Gsf with 10 liters of water in a bucket and use a wash mitt with the two-bucket method. For particularly dirty vehicles, 10–30 ml of Green Star can be added per liter of finished foam mixture in the lance—the foam then becomes an active foam with a higher pH value. This combination is not intended for weekly routine on sealed vehicles, but for heavily soiled seasonal washes or workshop vehicles.

Notes: Only apply Gsf to already wet paint surfaces, never to dry paint—otherwise loose sand particles will be rubbed into the material and can cause micro-scratches. In direct sunlight or air temperatures above 25 °C, always work in the shade and clean panel by panel, otherwise the foam will dry and leave streaks. Gsf does not remove baked-on insects, tar spots, or brake dust—specialized products such as insect or tar removers and acid-free wheel cleaners are responsible for these. Store in a cool, frost-free place between 5 and 30 °C, unopened for 24 months, use within 12 months after opening. Wear protective gloves when handling the concentrate and avoid eye contact—see safety data sheet.