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<p>[QUOTE=&quot;rotobeast, post: 263181, member: 8671&quot;]I&#039;ve had great luck with Hydrogen Peroxide on copper coins.</p><p>Yours looks to be the soft type of green gunk, so it should come out pretty easy with a soak.</p><p>I can&#039;t tell you how long it will take, but as a rule of thumb I check a soaking copper about every 15 minutes.</p><p>Also, I find shot glasses make very nice cleaning containers.</p><p><br /></p><p>Oh, if you have a coin that has the green stuff impregnated into the metal within the details, don&#039;t bother soaking it.</p><p>If you do, it will eat away details and all.</p><p>It is best to leave the coin the way it is.</p><p>I learned the hard way.</p><p><br /></p><p>I hope that helps a little.</p><p><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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