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<p>[QUOTE=&quot;physics-fan3.14, post: 2383039, member: 19165&quot;]Don&#039;t use anything harsh that will further damage the surfaces. Don&#039;t use any sort of polish or cleaning methods intended for silverware or jewelry.</p><p><br /></p><p>I believe one of the gentlest methods is to use a product called &quot;MS-70.&quot; These substances should be used sparingly, and almost always diluted (you can wind up doing more damage if not carefully done). I&#039;ve never actually dipped a coin myself, but I&#039;m sure others here will be able to help you. Some products are harsher than others, but there should be a selection at any coin supply store.[/QUOTE]</p><p><br /></p>

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