Get PS21 Gel Wheel Cleaner from Phil at Detailers Domain. Spray it on your wheels and agitate/spread with a brush or you can use a sponge. Spray the inner parts of your wheel and agitate with a brush. Let the gel sit for an hour or so. According to others you can even let it sit overnight. The longest I've let it sit is about 2 hours. Come back and hit the wheels with the water hose and brushes/sponges. Works like a charm. Good Stuff.