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<p>[QUOTE=&quot;messydesk, post: 2128637, member: 1765&quot;]Cleaned in general doesn&#039;t mean &quot;not filthy.&quot;&nbsp; Removing surface dirt and grime in such a manner as the surface metal oxides are not disturbed (acetone, or even a soak in water if we&#039;re actually talking about dirt) is almost always acceptable.&nbsp; What is not acceptable is abrasive cleaning or chemically stripping the oxides in such a manner as to make the coin look like the oxides were stripped.&nbsp; Note that wiping a coin with a towel can look like abrasive cleaning if there were loose dirt particles on the coin.</p><p><br /></p><p>Without knowing how your results would look on the coins you have, I can&#039;t tell whether your professional cleaning would be acceptable or not.&nbsp; Find a circulated, dirty silver Washington quarter, show us before and after pictures, and we&#039;ll comment.[/QUOTE]</p><p><br /></p>

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