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<p>[QUOTE=&quot;Paddy54, post: 2892916, member: 19250&quot;]Yes they used an ultrasonic machine , sort of like a jewlery cleaner that virbrates the dirt loose,however it doesn&#039;t always get all of the dirt,and it leaves traces of evidence around the devices. There&#039;s several others areas that show embedded dirt that the ultrasonic didn&#039;t break loose.,&nbsp; also the carbon spots on the reverse... it faded the&nbsp; somewhat but didn&#039;t remove them....they shall return in time.</p><p>The ultrasonic machine is used by a jeweler to remove like soap,and other crud from around a stone in a ring,or piece of jewelry. It also removes the polish used to buff a piece of jewelry. The solution most times used is common household ammonia. </p><p>By using this the sniffer can detect the coin has been cleaned,most probably why the coin isn&#039;t stabbed.[/QUOTE]</p><p><br /></p>

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