If you think the coin may have some value as a collectors item, the best thing to do is not to clean it. Cleaning can reduce or eliminate any collectors vale.
The deposits on the surface of the coin were part of the coin body. Removing these deposits is removing part of the coin. A coin collector will not do this.
No. Coins always lose value when they are cleaned when compared to uncleaned coins (the exception being coins that are dug out of the ground that are encrusted in dirt). Do not clean your collectable coins!
The short answer is, do not clean your coins.WARNING - There is no way you can clean a coin without damaging the finish and reducing any collector value it may have.Some coin catalogues suggest that you might use a soft brush on copper or bronze coins and, that there are professionals capable of cleaning coins.Since you state that your coin is a collector coin, go with the short answer and do not clean your coins.The best way to keep them is in some form of a protective casing or packaging to keep dust, moisture and finger prints off them. Most coin dealers will sell something suitable for storing your collectible coins.
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