I'm new to this forum, but i have had this same problem on many gm cars. my solution to this is 1of 2 ways. first if the car stays in the garage i just polish as you have and reinstall. every once in a while i hit them with mothers to bring back the high gloss because the will dull over time. the other way i do it is to polish them and then clear coat them. it makes them a little duller but shinier than original but you don't have to polish them. Ive been satisfied either way.good luck with your choice.steven
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