are they clear coated? IF NOT, try cleaning the wheels with an acid wash and a steel wool pad.
u can try "Bar Keepers Friend" which is mild.
or eagle one makes a "etching mag cleaner" which is stronger.
either one will leave a clean base and you will need to repolish.
again, this is only for bare aluminum!!
2002 F-250 ccsb, 7.3, Auto, 4x4, BDP Tunes, Stealth Drop In, 4" MBRP, 6637, Van turbo WW ATS, Frantz Bypass,Drilled & Slotted Rotors