Re: How to remove aluminum oxidation?
Be careful, if the frames are anodized, and you sand and polish them, then your committed to keeping them polished from then on. You may be able to use some very light steel wool and lightly rub away the polish, if done right will do the least amount of damage to what's left of the anodized coating. Not all are anodized but most that I have here are.
You could also clean the aluminum, prime it with self etching primer and zinc chromate and paint it the color of your choice? Flat black, silver, white, etc.