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<p>[QUOTE=&quot;quartertapper, post: 1026244, member: 16104&quot;]To my best understanding, sonic cleaning could potentially remove any spots in a copper (and possibly other metals) that have impurities in the metal. This would give it a pitted surface. So, technically if you had a perfect coin with noimpurities on either side of the coin you could safely clean it in that manner. But, of course you wouldn&#039;t know until you actually sonically cleaned it.</p><p>&nbsp;</p><p>You can carefully remove surface dirt and grease with acetone. But, attempting to remove corrosion, dullness, or oxidation will result in surface damage for sure. Best advice: if in doubt, do not attempt cleaning.[/QUOTE]</p><p><br /></p>

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