I use "Autoglym magma" it's ph neutral so won't harm finishes, spray on cool dry wheels, agitate with a soft brush, I use a 2" paint brush then rinse off, DON'T let it dry on!! when there clean give them a good waxing, I use Autofiness "mint rims", once you've waxed them ( takes ages btw!) then muck simply won't stick and they'll clean up with normal car shampoo.
I treat my wheels twice a year, well worth the effort.
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