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The mas is the best of the 3 for steel, but flitz seems to work best for the plastics, bakelite, phenolics, ect. It was originally marketed to restore plastics and headlights on autos.

Not sure, you could check for flitz, any chrome safe metal polish will work for the steel, and buffing compound and swirl remover, that you use to buff car paint will work on the scales. To protect...

As copper suggested, start with some chrome safe metal polish, and clean any gunk off to see what you are starting with. You can go to hobby lobby near the airbrushes, alpha abrasives sells packs of...