As a fan of ONR myself (although I must admit, I mostly use it as a cheap QD for removing polish residue, and as a clay lube... After LSP I use a better QD) I understand how you would wash the paint on a very dirty car with ONR, however what I dont understand is how you deal with bad wheels. I mean i suppose i you only clean the front, and don't remove all the brake dust, but even on normal cars cleaning the wheel backs is just not gonna happen with ONR unless they are cleaned and protected very often. I speak from experience, because although I use a pressure washer+ foam gun on my customer's cars, my car mostly gets ONR and ONE and I have used ONR on my, and other wheels before. And while it is a very good wheel cleaner, it cannot handle serious brake dust. For exampl, every mercedes or BMW I have ever detailed has needed a strong wheel cleaner, usually p21s gel left to dwell or a long long time, or (I try to avoid this) megs wheel brightener.
How do you deal with german wheels using ONR? Do you spray them with a strong cleaner and then wash it off with ONR?