It looks like caked brake dust has baked into and destroyed the clear on the finish. You will need to sand and polish those back down to fix it. Takes quite a bit of work.
See this thread:
Polishing BBS RS....HELP
#1
the black stuff was on my wheels when i bought the car and i havent been able to get it off. is there anything i can do to remove it?
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#2
It looks like caked brake dust has baked into and destroyed the clear on the finish. You will need to sand and polish those back down to fix it. Takes quite a bit of work.
See this thread:
Polishing BBS RS....HELP