Try SONAX.
Couple years ago I seriously thought the wheels would need resurfacing, powder coating. They looked that bad. Scrubbing them was little help.
Sprayed on SONAX, available Amazon etc...
Spray it on, watch it change color from green to red, 3-5 minutes, spray off w/high pressure water at coin operated car wash.
They came out looking like new, and I have spoke type wheels.
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