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I've got some scratches in the Polished (not plastic chrome clad) 20-inch wheels. Not deep, I think, as I can't feel the scratches with my fingernails.
I have those same wheels. I bet there is a protective coating on them, so they will keep the polished look. I wouldn't buff them as the coating will be removed. Good luck.
There are profesional co. that specialize in repairing stock wheels. The wife just had the curb rash repaired on her 2015 Mercedes. Cost was right around a $175 if I recollect.
Since the wheels are coated, you need to use a clear coat safe polish, it won't take the coating off, same as polishing your paint, you just can't use an aggressive polish. Not sure it will completely remove deep scratches though. I've used this, works okay...Meguiars Ultimate Polish
Good luck.