Thanks Geoff, I'll have to try some of the p21s from a Skoda dealer. £5 sounds like a good price!
I came across a lambswool wheel brush a few months ago in halfords. It's actually part of the Flash Carwash system I think and it's just long enough to get to the inner most part of the wheels.
I will also try a misting type spray for the EGP as you suggest - good idea
