After hearing all the complaints about brake dust and experiencing the frustration of trying to clean them. (many products just don't cut it) I tried Maguires Hot Wheels wheel cleaner. This stuff works. Spray it on cool wheels, let it soak a bit and then hose it off. Be sure to rinse well and dry and you won't believe your eyes. It is great. I let my wheels get pretty bad to the point where they were black and the Maguires pulled through.