the clear on my wheels was coming off so i stripped it all off with some "aircraft coating remover" in an spray can. i found it at a paint shop or at the autozone too. it's nasty stuff so don't get it on your skin, breathe it in, or get it on any painted or plastic surface you don't want ruined. took the clear off really well. once i got it all off i used a product calle Wenol, an electric drill, and a cotton wheel to polish the aluminum. one problem though, if you don't re-clear with something good, the shine won't last unless you keep polishing. i used some very mild cleaner and soap on my wheels afterwards and it dulled and streaked them. i would suggest not using duplicolor clear, didn't work for me. i did like the POR 15 clearcoat product though, hard as nails but a bit hard to get a nice coat on unless you have a paint gun/sprayer.
that's my $.02, good luck