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<p>[QUOTE=&quot;calcol, post: 24699872, member: 77639&quot;]The spots may be due to sweat, spit or snot, deposited long ago.&nbsp; In that case, the spots will be mostly dried, denatured protein along with some salts, which may have caused some corrosion.&nbsp; For these biocontaminants, acetone and water rinse are unlikely to do much.&nbsp; Best choice is an ultrasonic cleaner with warm distilled water and a simple, chemically pure detergent.&nbsp;&nbsp; Example of a simple, chemically pure detergent is sodium lauryl sulfate … available on Amazon and cheap.&nbsp; Sodium lauryl sulfate is an anionic detergent (most household detergents are), so a solution of it is slightly alkaline.&nbsp; Therefore, coins should not be exposed to it for more than the time they spend in the ultrasonic cleaner.&nbsp;&nbsp; An alternative is a nonionic detergent such as BRIJ, Triton or Tween.&nbsp; They don’t have an effect on pH.&nbsp; Whatever you use, do a good rinse in distilled water afterward.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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