Answer (1 of 5): Scratch marks? You could polish the surface but that would erode and degrade the raised design. There are some easy ways to clean off casual dirt, the easiest is running water and gently running you fingers over the coin. Anything more aggressive requires chemicals. This usually
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How can you tell if a coin was cleaned, and does it reduce the value a lot. : r/coins
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I have a Belgian 1€ coin from 1999. I want to clean it and that it will not lose its value (like, that it'll stay, 1€). What's the easiest and safest way
There is a white layer of stuff on my sterling silver necklace how do I get it off? - Quora