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<p>[QUOTE=&quot;DW-coins, post: 1308401, member: 33380&quot;]Before you consider cleaning (or conserving) your coins you need to determine what it is you&#039;re trying to remove.&nbsp; An improperly cleaned coin will be one that shows friction lines due to a cloth or brush scratching against the surface, so the way you conserve your coin is very important, as is determining what is on your coin that you want to remove. If it&#039;s just a dark patina that is distracting to the eye you certainly can &quot;dip&quot; them quickly and they&#039;ll still be eligible for grading. I think 50:50 solution of ammonia is very good for this and very gentle. It&#039;s nothing like the strong &quot;EZ-clean&quot; or other products that rip the surface off. Also, keep in mind that a dipped coin is not considered &quot;improperly cleaned&quot; but repeated dipping can cause a coin to lose a tick or two in grade.&nbsp; </p><p>If, on the other hand, it is simply grim and dirt from leading a rough life, then an acetone bath or even warm water with dilute dish soap can do wonders. But again you would want to do nothing that would leave lines or impressions on the surface of the coin itself.[/QUOTE]</p><p><br /></p>

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