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<p>[QUOTE=&quot;cladking, post: 1727894, member: 68&quot;]I have the best luck with a mixture of about half acetone half denatured alcohol </p><p>mixed with a generous amount of 91% isopropyl alcohol.&nbsp; If the water level is too </p><p>high then there is a big risk of dark irremovable spots on the cu/ ni.&nbsp; </p><p><br /></p><p>If this doesn&#039;t work then sometimes pure isopropyl (91%) will.&nbsp; Long soaks are riskier</p><p>and if it doesn&#039;t come off in three days it probably won&#039;t.&nbsp; It&#039;s less effective for 40%</p><p>silver and cents.&nbsp; </p><p><br /></p><p>A lot of these coins are &quot;common&quot; only because they&#039;re in mint sets and as many as 100% </p><p>of mint set coins are destroyed (such as the &#039;68-P cent).[/QUOTE]</p><p><br /></p>

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