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<p>[QUOTE=&quot;Oldhoopster, post: 3048359, member: 84179&quot;]I just soak put them in a jar for a few minutes.&nbsp; In my experience. most PVC residue and light organic junk comes off fairly quickly.&nbsp; I also dab the questionable areas with an acetone soaked Q-tip.&nbsp; &nbsp; If you&#039;re not making progress, then there&#039;s a good chance that you have something on the coin that isn&#039;t soluble in acetone. </p><p><br /></p><p>[Caution: I have been doing this for a long time and have experience as too which coins would benefit and which coins are best to leave alone.&nbsp; I would not use a q-tip with valuable or high grade coins.&nbsp; Practice with some cheap coins].</p><p><br /></p><p>Rinsing with distilled water is best.&nbsp; I do not like tap water because if it dries on the coin AND you have mineralized water, you can leave a mineral residue.&nbsp; Do you really need distilled water? Many here will say no and I&#039;m not going to argue with them, especially if the coins are common.&nbsp; Until you get some experience, distilled can&#039;t hurt. </p><p><br /></p><p>PVC plasticizer residue is green.&nbsp; Will acetone work on white residue?&nbsp; Don&#039;t know.&nbsp; If it&#039;s an organic residue, then acetone is will work a most of the time (It doesn&#039;t work all the time on organics, but I&#039;ll leave that explanation for the chemists).&nbsp; If it a corrosion or toning byproduct, then it probably won&#039;t work.</p><p><br /></p><p>BTW: Acetone is flammable.&nbsp; Use it in a well ventilated area away from heat sources.&nbsp; You probably don&#039;t want to put it in a plastic container unless you know that it won&#039;t react (ever pour gas in a styrofoam cup?).&nbsp; It also may or may not react with countertop laminates.&nbsp; Don&#039;t find out the hard way.[/QUOTE]</p><p><br /></p>

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