Ive used 3 or 4 previously and chemical guys no touch stuff is what I use religiously now.
Snow is a gimmick.As said, 2 bucket method and a decent shampoo will do the job .
I see the benefit of not touching the paintwork but unless the foam is so strong it literally strips all dirt and road muck off the car, you're going to have to touch it at some point! I'm going to try it. Which one though???!!
Not recommended on anything other than company cars though
The new Valet Pro Advanced Snow Foam is about the only one I'll touch now. Most are too aggressive and will strip wax rather quickly, or too mild and do very little at all.It's not cheap at £28, but it is the best.