Contact Griot's Garage in Tacoma Wa (800) 345-5789. I have had good luck with using paint cleaning clay on the wheels, then a very good quality wax. After each wash, use a detail spray on the wheel like you would on the body to extend the effectiveness of the wax. On wash day, I use Griot's car wash soap and a boars hair wheel brush. The brake dust floats right off.