Yes, snow foam really works. Applying snow foam to your car softens the dirt that is on your car, allowing dirt to be washed off easily without physically touching – hence reducing the chance of scratches. Just don’t expect yourself to snow foam a car and be done with it.
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Whilst it will not allow for a 100% touchless wash, it does a pretty good job and removing the bulk of the dirt and is worth adding in as a pre-wash stage. It is particularly good at removing road salt in the winter months which is a complete nightmare.
The best snow foam that I have found is the Bilt Hamber Auto Foam. It foams like you see in Snow Foam YouTube videos, and has the best cleaning power of any snow foam I have used. Another recommended Snow Foam to use would be the Autoglym Polar Blast.