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<p>[QUOTE=&quot;Kentucky, post: 1605033, member: 33176&quot;]There are two different kinds of solvents for &quot;stuff&quot; that can be on coins, polar and non-polar.&nbsp; Polar solvents like water and alcohols will help to dissolve or lift polar materials like common dirt, salts or some dried glues or syrups.&nbsp; Non-polar solvents like toluene, xylene, hexanes, will dissolve oils and greases.&nbsp; Solvents like acetone and MEK (methyl ethyl ketone) are good mostly for oils and greases.&nbsp; Now to take off generalized crud, one should usually start with water (hot tap water is a good start) which can be tap water, but which should be followed with a rinse with distilled or deionized water if your city water is as salty as mine.&nbsp; If the coins are of low value, you might even want to add some soap or detergent (not going to make the distinction) as long as they are given a THOROUGH rinse with some hot tap water and then deionized or distilled water.&nbsp; If this is no good, you can try the other solvents I mentioned, always holding in mind that some of these are reputed to tone copper.[/QUOTE]</p><p><br /></p>

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