I have a set of 17" 7-Spoke Mercedes wheels that were powdercoated metallic silver a few months ago. I recently started cleaning them with Sonax Full Effect Wheel Cleaner and scrubbing with various brushes, but no matter what I do, there are some spots of brake dust on the faces and on the spokes that will not come off. Almost seems like the dust stained or somehow bonded into the finish. I partially blame my father who tried cleaning them with a harsh chemical degreaser while the wheels were "warm", but that may or may not have anything to do with it.
I will post photos as soon as I can.
What would you guys suggest I try to do to get rid of the black spots? I really want these completely clean so I can wheel wax them and keep them protected.