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<p>[QUOTE=&quot;desertgem, post: 657588, member: 15199&quot;]Not answering for Doug, but using air pressure with small orifice jets can dislodge grit and grime ( dirt, sand, organic oils, bodily secretions, etc. ) if such&nbsp; is loosely held on the coin. But the caution ( yes, I know that is one of your peeves <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /> )is that it can function as a &#039;sandblaster&#039;, just as haphazardly pushing grime around with a toothpick can. The dirt/grime can have abrasive action on the coin surface. I would rate it below the &quot;green rose thorn/liquid lubricant&quot; technique myself since the latter tends to lift off some and suspend it.&nbsp; IMO.</p><p><br /></p><p>In case anyone is interested, I have taken a Waterpik(tm) , fashioned a smaller orifice from a tuberculin needle, and used a Voltage regulator to put 140V to it, and it would only remove part of the gunk. Felt guilty about returning it to Costco, so I kept it.<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie7" alt=":p" unselectable="on" unselectable="on" /></p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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