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<p>[QUOTE=&quot;lordmarcovan, post: 24557182, member: 10461&quot;]Loose grime can be cleaned off with water and a soft cloth.</p><p><br /></p><p>The main thing is that you don&#039;t want to disrupt the coin&#039;s patina.&nbsp; Removing loose dirt is OK.&nbsp; And you can even gently rub a coin to do so, but don&#039;t <i>polish</i> it, because then you&#039;re messing up the patina.</p><p><br /></p><p>Here&#039;s my pro tip if you&#039;re talking about copper: <i>Vaseline.&nbsp; </i>You can rub petroleum jelly (Vaseline) or mineral oil on a grimy copper coin, then wipe it all off with a soft cloth or paper towel, and it will take the grime off without changing the coin&#039;s patina and natural color.&nbsp; (Unless you rub it <i>too</i> hard.)&nbsp; A wooden toothpick or bamboo skewer can be used to work crud out of the crevices, since the wood is not hard enough to scratch the metal.</p><p><br /></p><p>The &quot;don&#039;t clean&quot; advice basically means, &quot;don&#039;t alter the coin&#039;s surfaces&quot;.&nbsp; It doesn&#039;t mean you can&#039;t remove dirt or grime or other scuzz that might come off while still leaving the metal surfaces intact.</p><p><br /></p><p>If you used certain chemicals or mechanical means, it would affect the patina.&nbsp; See what I&#039;m getting at?&nbsp; That&#039;s &quot;bad&quot; cleaning.[/QUOTE]</p><p><br /></p>

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