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<p>[QUOTE=&quot;satootoko, post: 209233, member: 669&quot;]Acetone will attack organic substances and remove them from coins.&nbsp; I suspect that some of the byproducts in cigarette smoke may be inorganic, in which case acetone may improve the coin&#039;s appearance, but won&#039;t do the whole job.</p><p><br /></p><p>Normally all that is necessary is a few seconds in a glass dish containing pure acetone - not nail polish remover or other acetone with chemical additives - followed by repeated rinses in distilled or deionized water, and air drying on a soft cloth.&nbsp; In the case of heavy PVC or other organic contamination, multiple rinses, each time in fresh acetone, may be needed.&nbsp; A 15-minute soak shouldn&#039;t hurt, but it isn&#039;t necessary.[/QUOTE]</p><p><br /></p>

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