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<p>[QUOTE=&quot;blsmothermon, post: 1079999, member: 26158&quot;]Paper towels scratch coins, rubbing with fingertips and distilled water can leave abrasions on the surface of a coin, all soaps contain acids or alkalis that will destroy luster, tap water contains chlorine and will destroy luster by simply soaking. All of these and more are possible in cleaning. As has been said, once damaged always damaged. (Unless the coin is conserved.)&nbsp; The only way, as has been said, to remove debris from a coin is to use a solvent with a high flash point (like acetone) which will dissolve surface contaminants and evaporate with no residue. As for museums, they are not numismatists. On average, museums dip, polish, and lacquer their coins. All they care about is display and preservation. (Not all, obviously, but most.)[/QUOTE]</p><p><br /></p>

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