I have had great results with Meguiars Hot Wheels All Wheel Cleaner. But... the first time I took each wheel off and cleaned it front and back, then polished the wheels front and back. Each wash I get a sponge and clean as much of the back as I can get to as well as the fronts. This has been working well for a while now. Suggest getting a tyre (tire) brush to help get at all the nooks and crannies.
Hope this helps.
Geoff
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