Well this Saturday I am planning on doing a full detail on my bmw. Now I haven't really touched the car much this winter and subsequently the wheels are now coated with brake dust. The strongest wheel cleaner I have right now is ps21 gel but the last time I cleaned the wheels when they were bad the ps21 wasn't able to get off all of the brake dust. So I was wondering if using grime destroyer full strength on the wheels would 1.) Work better than ps21 and 2.) be safe for the wheels. Anybody ever try this before? p.s. I'll upload some pictures asap to help you guys out.