The frames can be cleaned with many things. I would suggest cleaning any clear coat that might be remaining with a paint stripper or lacquer thinner. Then using a wet 1500 micron sand paper will work like a polishing compound, but easier to do.
I would not leave the aluminum bare. It will corrode too fast in a salt environment, like one or two years, even if waxed. Best is to have them anodized, this will last indefinitely. You can paint with a self etching two part epoxy primer and paint, that will last about 10 years, maybe more with the right paint. You can clear coat them. There are a number of products, but UV will eat these finishes just like varnish on wood...5 or so years.
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