Let me start off by saying that I'm not a fan of the spray on and wash off type cleaners in general. There's a lot to be said for a little elbow grease. But I have to say that I'm EXTREMELY impressed with the results that I've seen from Mother's FX wheel cleaner.
If anyone's got brake dust caked wheels or you really want to clean off the back of the wheels that you can't reach with a mitt or rag, give this stuff a try.