For the last year i've been washing my cars in the garage with ONR and a garden sprayer. One thing that's never worked great was doing the wheels. I have german cars that have a ton of brake dust and the ONR usually can't handle it. I've watched Scottwax's video on youtube and he uses Optimum Power clean on the wheels. Does anyone else do this? If you used this and then sprayed off any excess with the garden sprayer would that be alright? I don't want to damage my rims by leaving product on. Are there better alternatives?