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<p>[QUOTE=&quot;Kevin Mader, post: 25257331, member: 106826&quot;]My rule of thumb is to go from least/no impact to strongest solvents.&nbsp; I read here somewhere that Dawn could adversely affect copper coins and suggested Ivory soap.&nbsp; But, I would use distilled water first and if that doesn&#039;t work, use acetone.&nbsp; </p><p><br /></p><p>One thing I learned: don&#039;t underestimate the value of distilled water.&nbsp; It may take longer, but it really works better than folks might think.[/QUOTE]</p><p><br /></p>

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