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<p>[QUOTE=&quot;SuperDave, post: 2313941, member: 1892&quot;]Ultrasonic cleaners work using collapsing cavitation bubbles in liquid. They&#039;re tiny, but the bubble collapse generates 5000 degrees Centigrade and a velocity of 500mph. One can expect an ultrasonic cleaner to wear through its&#039; own container during its&#039; lifetime; imagine what it could do to a softer metal coin if misused.</p><p><br /></p><p>There&#039;s a number of coin-specific considerations to employing ultrasonic cleaning, and it&#039;s only more effective than far less dangerous methods in a few niche cases. Nothing I&#039;d use &quot;regularly&quot; for conserving coins.[/QUOTE]</p><p><br /></p>

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