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<p>[QUOTE=&quot;Tamaracian, post: 8181372, member: 23122&quot;][USER=101202]@GH#75[/USER]&nbsp; There used to be a product called Koinsolv (mfd by E &amp; T Kointainer Co.) and distributed by Amos Advantage, Wizard Coin Supply and others that was made specifically for removing PVC; Oil; Tape Residue and Grease from coin surfaces without leaving any residue; alas, it was discontinued by the manufacturer but may still be available in certain areas.</p><p><br /></p><p>I generally agree with [USER=105571]@Publius2[/USER] about how to handle and identify &quot;true&quot; Acetone; as stated by he and others, Acetone is very volatile (Flashpoint -4 degrees F/ Boiling Point + 94 degrees F) and is regulated as a toxic chemical in groundwater pollution, but is <i>not</i> under EPA or FCAA as an environmental air pollutant, so allowing the dirty, spent solvent to evaporate outside in an open container or on a hard cement surface where it is not possible for it to seep into the soil is OK.</p><p><br /></p><p>Aside from the Reagent Grade Acetone that [USER=84179]@Oldhoopster[/USER] alluded to--which is quite expensive, and costly to ship--the commercially available quarts or gallons from Home Depot (Kleen Strip) or Lowe&#039;s (JASCO) will suffice for the gross cleaning of most residues, but because they are not without contamination (see below), you will need to follow up that Acetone gross cleaning with either another quick-drying solvent that is pure (see below for my preferred agent), or a clean water rinse, followed by a non-abrasive drying (see below for my preferred method).&nbsp; The Kleen Strip or JASCO Acetone (I&#039;ve used both) are not totally free of contaminants (ex: rust from the steel container, solids from various sources during manufacturing and filling operations, and chemicals from the formulation phase); pure Acetone is <b>colorless</b>, so if it has contamination you will see an amber coloration to it, and/or particulate in the pour (concentrated at the bottom of the container).</p><p><br /></p><p>The commercial Acetone can be used for multiple cleanings and will still be effective as-long-as you follow up with a &quot;clean rinse&quot;.&nbsp; You can store the <b>used</b> Acetone in an a Polypropylene container such as an empty, thoroughly dry, Isopropyl Alcohol container (yes, it is non-reactive to acetone), or when you finally use up a quart metal Acetone container. </p><p><br /></p><p>Now for the &quot;final cleaning&quot; and drying that I use and recommend:&nbsp; (1) although I do, on occasion, use tap water with some Dawn followed by a DI or Distilled water rinse to remove some types of soils that Acetone doesn&#039;t completely remove, I mostly use a product called Brakleen (tetrachloroethylene) (<span style="color: #00b3b3"><a href="https://www.crcindustries.com/products/brakleen-174-pro-series-brake-parts-cleaner-non-flammable-29-wt-oz.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.crcindustries.com/products/brakleen-174-pro-series-brake-parts-cleaner-non-flammable-29-wt-oz.html" rel="nofollow">https://www.crcindustries.com/products/brakleen-174-pro-series-brake-parts-cleaner-non-flammable-29-wt-oz.html</a></span>) which can be purchased from auto parts stores.&nbsp; Brakleen is a pure solvent that rapidly dries without leaving a residue, and is relatively inexpensive ($8.99 for 20 oz. @ O&#039;Reilly).&nbsp; (2) after the final rinse, when the coin is still moist, I used <b>canned air</b> to blow off any remaining solvent or water.[/QUOTE]</p><p><br /></p>

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