The boundary between cleaning and restoration is small among the purist. Different metals propose different techniques.
The gouge on the upper cheek must be pretty gnarly. (95S)
I wouldn't call acetone or a distilled water rinse cleaning.
The bright white and MS coins are the only ones I would venture with and that depends on the coin.
Unfortunately, not much can be done. A rinse in acetone is harmless to nearly all coin metals, and it would remove possible (new) fingerprints....
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