Steve
I tried Mother's Alum Wheel Cleaner/Polish, but a friend steered me to a German product. After the Mother's cleaning, I tried some Autosol and it took more dirt from the wheel and gave it a better shine.
Its expensive, but I use it on all the aluminum on my Cobra. A little goes a long way.
http://www.eastwoodco.com/jump.jsp?i...emType=PRODUCT