After trying a variety of metal polish (Wenol, Mother's Billet, etc), I settled on the new
Meguiar's NXT Metal Polish, followed by a heavy coat of NXT Wax on both the polished and gray painted cast area of the wheels.
They have a deeper shine with the NXT metal polish than previous products.
I am considering Zoop Seal this winter when the Mach 1 goes to garage queen status.