I had always heard that Pledge in non-aerosol bottles was best for tinplate. I used it for a while after I did a total cleaning of a piece (no water, just a little McGuire's liquid car polish). A little bit of the pledge and a nice careful buff with a clean rag would make them shine nice, though they would seem to dull back to their natural patina after a while, and it never seemed worthwhile to repeat the process.
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