Okay, so my Style 5 rims are back on after a year of storage and the car is fresh from the detailer.

Foolishly, I neglected to clean off my summer rims before storing them for the winter. Now two of them have some caked-on brake dust that my detailer couldn't get off.

It's on there really good. I can scratch it off with a fingernail, but all my detailer's potions and lotions failed to make a dent. He was using metal polish, which I explained to him was not ideal because the rims are clearcoated. But what is ideal? What will get this crap off?

Thanks!