You don't clean them....tarnish is a characteristic of silver and you can do more harm than good by trying to clean them.....many times coins are sold at a higher value just because of tarnishing....I have some bars and rounds from many years back that have some very nice tarnishing even though they have always been in a completely dry enclosed area along with dehumidification pacs....HL and Orca would know much more about nunamistic values associated with tarnished coins...
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