I use Mother's Mag and Aluminum Polish on mine...works great.

http://www.motherswax.co.uk/products/tyrewheelcare.htm

I like the idea of finishing up with the sealer...I'll try a good coat of wheel wax on mine.

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2005 X5 4.4 (Sterling on Truffle) w/sport everything
2011 Audi S4 (Prestige, DSG)
2012 Audi Q7 (Sport, S-Line)