Try CLR or Brasso they polish up metal and remove oils that can discolor the metal. As long as it's actually metal you should be fine but if it's metal topped off with a gold or silver tone paint then it's probably not going to help because the paint is chipping off. Also if it is just metal just put a little brasso on a cloth and rub away and this should help polish it if it needs major removal follow the CLR instructions and soak jewelry and rinse off. Hope this helps and vintage is always hot and never goes out of style.
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Jewelry Forum
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How do you clean vintage jewelry that is gold-toned (not real gold)? 
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