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<p>[QUOTE=&quot;GDJMSP, post: 67874, member: 112&quot;]I wouldn&#039;t recommend running water - no sense in having even more deposits on the coin from tap water. Use distilled water to rinse the coin - water preferably at room temperature.</p><p><br /></p><p>PVC, unless it has hardened and dried over time, will usually appear as an oily, slimy coating on the coin. Verdigris, also a green substance typically found on copper but also on silver at times, is a dry, crusty corrosion that look like raised lumps of green stuff on the coin. </p><p><br /></p><p>Both of these substances <u>MUST</u> be removed from the surface of a coin or they will continue to do further damage to the coin and literally eat it up over time. </p><p><br /></p><p>It is better to have a cleaned coin - than no coin at all.[/QUOTE]</p><p><br /></p>

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