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Correct. Using a metal polish in effect seals the surface. As I said I wipe fingerprints and dust off with water and a little metho in it (helps the water to dry quicker and leave no streaks), and repolish every month or so.so when it gets dirty, i can clean it a bit easier than cleaning crap off raw aluminum, and it will stay looking nice.
My rocker covers are plastic and the motor is a late series one, so I guess not all are metal