Hey sorry if there is already a post like this, I looked but couldn't find one anywhere. I drive an EM1 and I love my wheels but they look like butt. I'm not sure if it's grease or brake gunk or maybe even rust, but this is what my wheels look like. I've tried car soap, tire cleaner, everything, but nothing gets this crap off. If you could take a look and give me suggestions it would be greatly appreciated.
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Almost looks like mold, but its prob just brake dust. Can be difficult to remove sometimes. Try using a good wheel cleaner like P21s Wheel Gel or Carpro Iron-X. Maybe use a tooth brush to agitate since its a little stiffer and will clean better than just using a wash mitt. Good luck!