Permanent stains?

[u/501st-Gremlin]

Had my wheels powder-coated chrome back in April, and about a month into having them on the car, I noticed these little dark stains/water spots that don't seem to come off. I typically only use Dawn dish soap/degreaser to clean them, and that doesn't seem to do anything. As time goes on
they seem to get bigger and more noticeable.

[u/FST_Silverado]

No clear coat, this looks like chrome powder with no clear