I have some aluminum chainguards that have patches of severe corrosion-- in places it has eaten right through to the other side. Obviously there's no way to restore these and replace the missing material, but is there a chemical that will eat through the oxidized part leaving the intact aluminum nice and shiny? Sort of like an aluminum equivalent of OA? My goal is to remove whatever corrosion I can, polish up, then clearcoat.
These are the guards in question. Poor pic, but notice the dark patches of corrosion. My normal method of scrubbing with steel wool and dish soap didn't polish them up nearly as well as it works on chromed steel: