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Anodized aluminum is aluminum oxide, used as sandpaper, blasting media, etc. It is extremely hard. It's not worth putting any effort into cleaning it up.
Strip it, only with chromic acid, polish it, clear it.
When I restore window frames, they are stripped, I start at 400 to remove pits, scars, scratches and go to 3000 and then polish and then anodize.
For you, if you really want, start at 1000 and go to 2000 and polish. Note that I have buffers and pneumatic micro sanders with foam heads to get a proper shine so take that into consideration if sandpaper ever hits the frames. Another way to put it, strip and polish and see if you like it. If you do, then clear. If you don't, plan on a lot of sanding.
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Tru6 Restoration & Design
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