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<p>[QUOTE=&quot;quartertapper, post: 1074005, member: 16104&quot;]Yuo could probably experiment with the proof Kennedy, as a circulated froof isn&#039;t really ever going to be worth anything. But, I don&#039;t know if there is such a thing as a &quot;gentle detergent&quot; when it comes to preserving coins. I&#039;m thinking that cotton swabs and acetone may be more gentle, but on a proof surface it may still show. As for the IHC, an ultrasonic bath is what I would use to remove the green crud.[/QUOTE]</p><p><br /></p>

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