Wheel cleaner?

[Eric_R_Kissell at whirlpool.com]

Have you tried "Purple Cleaner"?

CAUTION: Any cleaner including "Purple Cleaner" might damage the
appearance of your wheels.  Try a small test area first and do not blame
anyone but yourself if you damage your wheels.

That being said, the best stuff I found was called "Driveway Cleaner" or
"Driveway Oil Spot Remover" but I used it all up and could not find the
same stuff again.

I used paint thinner to remove any grease or tar and then I used the
Driveway Cleaner to finish the job.  Re-read the CAUTION statement above
:-)  YMMV!

HTH,
Eric