I polish my wheels a few times a year (usually when I polish my car), but the polish only stays on for a short while. It's been a few months since I did it, so you can't see the effect on the wheels anymore.
Besides, tire polishing substances are a real pain to work with, they're very oily.
A BMW 645 is not as quick or nimble as the SLK, but it has more seats. I think they're very different cars.
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My new car: MB SLK55 AMG (36months, 40,000miles and still flawless)
My old car: MB SLK230K Brabus - sold
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