Cleaning of coins
is always a no no!
Cleaning is usually considered doing something that changes the surface of the coin. Like rubbing the coin with polish or some type of cleaner like baking soda, etc. By rubbing the coins surface you will impart light hairlines to the piece. These are easy to see under magnification by turning the coin under a strong incandescent light bulb.
If you want to remove tarnish from silver coins it is better to use a coin dip like Jewel Luster, etc. Although you need to be careful with dipping as you can still ruin a otherwise great piece.
The proof sets and mint sets from the U.S. Mint are not air tight. The coins can and do tarnish, tone, get spots, and many times get a dull film on their surfaces. It all depends on how they are stored.
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