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<p>[QUOTE=&quot;John Anthony, post: 1828891, member: 42773&quot;]Ancient silver occasionally gets cleaned with various dilutions of vinegar or lemon juice. Sometimes the coins are even boiled. Coin soup anyone? But nobody expects coins that are thousands of years old to retain any sort of original mint luster. A proper cleaning of an ancient coin always adds to its value, and the vast majority of them have been cleaned, one way or another.</p><p><br /></p><p>Does this apply to Washington quarters? I&#039;m not sure. If they were only worth their melt value before, and are only worth their melt value after, then I see no harm in adjusting them to suit your aesthetic preference. If the coins were rarities, perhaps a gentler approach would be in order?[/QUOTE]</p><p><br /></p>

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