I snow foam our cars after blasting off the worst with plain water.
I always start with washing the wheels though, as it can splash onto the bodywork and even using PH neutral stuff it can take a layer of protection off your paint if you leave it on the car too long
After snow foam will hand wash with a lambs wool mitt and dry off with a towel 
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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