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<p>[QUOTE=&quot;hamman88, post: 928384, member: 7950&quot;]I own a very powerful ultra-sonic cleaner.&nbsp; It is physically impossible to harm the coin from pure vibrating water.&nbsp; There is probaly nothing better or safer to remove debris from a coin (unless it is a chemical and must be dissolved).&nbsp; The trick ,however, is to rig to the coin so that is not touching the sides (touching the sides would ruin the coin).&nbsp; Resting it on a bed of cotton may be an option.&nbsp; Somehow hanging the coin from above would be the best move.&nbsp; Attaching it would be difficult, slipping it into a rubber gasket would be a good method though.[/QUOTE]</p><p><br /></p>

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