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<p>[QUOTE=&quot;-jeffB, post: 4651196, member: 27832&quot;]I&#039;ve been meaning to try ultrasonic cleaning, but haven&#039;t. I&#039;ve seen hints here that the big grading companies sometimes use it as part of their conservation service.</p><p><br /></p><p>If you <i>do</i> try it, whatever you do, don&#039;t put the coins into the usual metal basket, and don&#039;t pile coins together. Any place where metal touches the coin&#039;s surface is going to get rubbed tens of thousands of times a second. The result won&#039;t be pretty.[/QUOTE]</p><p><br /></p>

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