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<p>[QUOTE=&quot;Mark Metzger, post: 3972043, member: 86472&quot;]Good morning. Thanks for the feedback on the coins. The method I used was warm water, dish soap and a sonicare ultrasonic toothbrush. I didn’t scrub with the brush but instead just held it over the cruddy areas and let the vibration do its thing. I would never consider such torture to an MS or a silver coin because of the possibility of hairlines, but with the old copper, it seemed not to damage the surfaces. The micro vibrations did a pretty good job of blasting away some gunk. I treated each piece for only about 30 seconds, so presumably, longer would remove even more. I might experiment with oils as well.</p><p>Happy New Year’s Eve eve![/QUOTE]</p><p><br /></p>

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