87 Coupe GT Wheels

["Jon" <jwilliam@ns1.water.net>]

I have the white wheels with the Audi logo on my 87 CoupeGT.  These 
appear to be the only thing the owner didn't keep in showroom 
condition.

Question: what are they made out of and what is the best product I 
can use to clean them?  I've never had colored wheels before and am 
afraid that I might damage the finish and/or color.  Product names 
and where I can purchase them would be greatly appreciated.

Jon