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<p>[QUOTE=&quot;gatzdon, post: 237359, member: 8247&quot;]Before you all faint, let me give the specifics.</p><p><br /></p><p>I like to search through circulated coins.&nbsp; I occasionally find proof coins in circulation, especially in the halves.</p><p><br /></p><p>About half the time, the proofs are still in excellent condition and I keep them as is.&nbsp; With the rest, I will give them a quick acetone bath to remove dirt and fingerprints.&nbsp; There is a small percentage that contain too much dirt for acetone to remove by itself.&nbsp; I&#039;ve even tried thiourea acid on ones that are so badly damaged from circulation that you almost couldn&#039;t tell it was a proof just by looking at them.&nbsp; While the thiourea acid provided remarkable results on those coins, I&#039;m still too hesitant to try it on ones that still have that proof luster (you know where you can tell across the room that it&#039;s a proof).&nbsp; (just to clarify, I always use distilled water rinse and air dry after acetone or thiourea acid)</p><p><br /></p><p>My question is, what would everyone else recommend for modern proof coins, with little value, to clean them after finding them in circulation?&nbsp; I&#039;m talking the ones where acetone isn&#039;t enough and the proof luster has already been damaged.</p><p><br /></p><p>The one that prompted me to start this thread is a 1981S proof half with some bright green crap on it that acetone did not even dent.&nbsp; I then tried the thiourea acid and it did very little (but it cleaned up the corroded spots very nicely).</p><p><br /></p><p>Now, I don&#039;t want to leave the green crap on there, but I don&#039;t want to actually scrub the coin either.&nbsp; I&#039;ve read about soaking in Olive Oil for several hours, but I don&#039;t know if that will remove the remaining proof luster from the coin.&nbsp; I&#039;m not willing to sacrifice this proof to find out (at least not without getting a second opinion first).&nbsp; Are there other things around the home that might work also.[/QUOTE]</p><p><br /></p>

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