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<p>[QUOTE=&quot;ffrickey, post: 2107652, member: 20613&quot;]Regarding cleaning, I live in Germany and soak coins in &quot;U-Verdünner&quot;, i.e. universal paint thinner, which is acetone and ketone, and assorted light hydrocarbons.&nbsp; I usually soak dirty coins for 2 weeks and have never noticed any damage, I don&#039;t think it can possibly hurt metal coins (might not be too good for some of the German ceramic &quot;Notgeld&quot;).&nbsp; But it does dissolve away gunk on the surface. After that, if it&#039;s a really nice coin, you might want to cover it in VerdiCare for 10 minutes to prevent future verdigris.[/QUOTE]</p><p><br /></p>

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