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<p>[QUOTE=&quot;Maxfli, post: 3626021, member: 69089&quot;]1) I would SAFELY CLEAN them by soaking in water. Water doesn&#039;t interact with the metal in the coins. It can, however, dislodge or remove dirt particles that may exist on the coins. Frankly, in this case, I don&#039;t think water will have much effect.</p><p><br /></p><p>2) Next, I would SAFELY CLEAN them by soaking in acetone or xylene. These compounds won&#039;t interact with the metal in the coins. They can, however, dislodge or remove any accumulation of organic materials that may exist on the coins. This is a particularly helpful step for circulated coins that may have gunk from decades of handling and environmental exposure, but again, I&#039;m not optimistic they will provide much benefit for your proofs.</p><p><br /></p><p>3) Given that these are low value modern proofs, rather than rare coins like the 1861 proof dollar posted by [USER=101855]@johnmilton[/USER], I would consider experimenting with MS70. Many posters here, including Doug, have said that MS70 is particularly effective on modern CuNi proof coins.&nbsp; I haven&#039;t tried it myself, but if I had coins like yours that needed help and the downside risk was minimal, I&#039;d give it a try . . . but I would dilute the MS70.&nbsp; You can always soak longer if the solution is too weak, but you can&#039;t un-soak.[/QUOTE]</p><p><br /></p>

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