I see alot of questions on cleaning tires and wheels here and to say which is the best method or product is all ones own opinion. In my experience I have found that this stuff called Purple Power works extremely well on taking dirt grease and brake dust off of wheels and tires. it is also really cheap. I found it at advanced autoparts but I get it at my local ma and pa hardware in the super size. Has anyone else used it. I have also used it to clean engine components. It's alot like simple green only alot cheaper and works better.