May I recommend a product?

[grc0456]

very heavily coated, old brake dust? I have tried Maquiars all wheel cleaner, Car-Pro Iron-X and P21S gel. All to a good job of removing light or new brake dust. My rims seem to have old dust "baked" into them. I have tried adding light mild abrasive scrubbing as well. Gets them to about 85% of the result I want.

[jotoole]

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.

[mountainman]

Been using sonax for quite a while and it is a great product. I try to take the wheels off about every 15,00 miles ( which comes pretty quick for me ) and inspect the brakes, tires, etc and give the wheels a good cleaning with sonax and then a couple of good applications of wax.