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<p>[QUOTE=&quot;Kentucky, post: 1645209, member: 33176&quot;]Some free advice that is worth every penny you pay for it.&nbsp; All vegetable oils are long chain fatty acids.&nbsp; The acid part is so weak that it probably has little effect by itself.&nbsp; The oil will get under the dentrius and help lift it off the coin.&nbsp; Following this with water would have little or no effect since the oil is not soluble in water.&nbsp; The use of a soap would remove the oil and perhaps help you (with the aid of a bristle brush like a toothbrush) to remove some of the crud.&nbsp; At this point you might also want to judiciously use a sharpened toothpick to remove chunks that look like they might want to come off.&nbsp; As to tap water having impurities and additives, the coin has probabily faced worse dangers over the years.&nbsp; If you do use tap water, there is no reason to leave any of these impurities and additives on the coin when they can be removed with just a rinse in distilled water.&nbsp; Harsh chemical cleaning can damage the surface causing pitting.&nbsp; Good luck and keep us filled in.[/QUOTE]</p><p><br /></p>

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