I have had some powder coated 16inch White DTMs for a year now and all I do is wax them every few months to remove the funky coloring for the dirt and brake dust. Powder coated wheels dont chip as easily and painted wheels do in my opion.

If you have wheels that are painted white and clear coated you may have more problems. The clear coat can sometimes change color from the wheel getting so hot.

Wax should clean them up.

Next time get bronze less cleaning required. Thats my plan.