The alloy wheels (original MB 8 hole style) on my 1995 E320 are starting to look a bit worse for wear. I wash them regularly but they're starting to pit and leave small markings on the surface that I can't seem to remove with just soap and water. I've tried some wheel cleaners but they don't make a difference. I tried some rubbing compound and that worked, but then I needed to wax the wheels. A friend suggested using the Mothers Metal Polish with the Powerball, but I understand it's only for uncoated metal surfaces. Has anyone found a good approach to keeping the wheels looking good? I've thought about buying new rims from adsitco.com - they're only about $150 a rim. No idea about the quality though.