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<p>[QUOTE=&quot;Oldhoopster, post: 7933328, member: 84179&quot;]NO Palmolive dish detergent.&nbsp; It may loosen dirt, but do you know what chemicals are in it?&nbsp; Do you know if those chemicals will react with the toning and/or metal on the coins surface?&nbsp; Does it leave any residue on the coin?&nbsp; Sorry, recommending dishwashing detergent to clean coins is irresponsible IMO</p><p><br /></p><p>Acetone and Xylene are good solvents that won&#039;t react with the metal surfaces or toning. Xylene will work on many organics that acetone won&#039;t touch .&nbsp; Dips such as EZest may work but the OP has expressed his concerns</p><p><br /></p><p>I think the black marks are something that&#039;s reacted with the surface, so solvents aren&#039;t going to work, but that&#039;s speculation on my part.[/QUOTE]</p><p><br /></p>

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