an older Z). They were clearcoated and it ate up the clearcoat and discolored the wheel material (I think some of the explanations below describe what the cleaner did). That's the bad news, the good news is I took them to a metal polishing shop and had them polished. They look better than they did when they were new. That may be an option for you to regain the good look to the wheels, although they may end up looking different than they were when new. Good luck, Mark