I have PVD wheels on my C5, you can use any "all wheel cleaner" that does not have acids in it. They scratch fairly easily so keep that in mind, and I'm talking like micro scratches which eventually look bad "hazy". You can take them out with a polishing compound every so often on the outer clear coat. For me, next time I'll just ceramic coat some polished wheels and be done with it...
09.1 G8 GT MSM Sport/Premium Onyx/Red
Mods: LSA w/2.85" pulley, LT1Z custom stage1 PDS cam, Solo Mach exhaust, Kooks mids,3.27 Camaro diff., Pat G tune, PPV shocks/struts, BMR sways, SuperPro front strut and BMR rear cradle poly bushings.
Show: F&R Brembo's w/drilled and slotted rotors, GXP rear diffuser, Advanti Racing Rein flow form wheels in 20x8.5"(23.5lbs.) and 20x9.5"(24.5 lbs.), 6K HID, triple Atari gauges, tinted windows. VE onyx/red hot steering wheel and shift knob.