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<p>[QUOTE=&quot;Kentucky, post: 2550667, member: 33176&quot;]While doing postgraduate work at Clemson University, my labmate came in carrying his motorcycle helmet and said something about having a stain or dirt on it.&nbsp; I turned just in time to see him grab the acetone squirt bottle, but my scream came a second too late... luckily he was able to buff out the haze with toothpaste. </p><p><br /></p><p>[USER=22331]@imrich[/USER] soaking a coin in acetone will eventually reach all the creases and crannies of the coin.&nbsp; Ultrasonic might help as would using a stream of the solvent, however prolonged soaking should do the job.[/QUOTE]</p><p><br /></p>

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