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Last time i had to clean aluminium a wet scotchbrite was perfect then surprisingly cotton balls gave me a mirrored finish. It was the backside of solar panel plate I was building up. I didn’t have corrosion eating in and the cleanup didn’t go through the thin aluminium layer so would probably do the trick well for scope mirrors. I dont know what would be good to apply to seal the aluminium from further corrosion in future though or if you need to apply a chemical treatment to stop any ongoing reactions or if anything wont start a reaction itself. I assume the coating thickness is tiny.
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