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<p>[QUOTE=&quot;kidkayt, post: 216854, member: 7275&quot;]Try TCE (trichloroethene) if the crud is organic, which is very likely.&nbsp; TCE must be handled very carefully.&nbsp; Else, ordinary 99% iso-propyl (rubbing) alcohol from your local drugstore with a soft Q-Tip could do the trick.</p><p>An ultrasonic cleaner (available at BedBathBeyond) can loosen a lot of grit.&nbsp; However the coin</p><p>should be supported with soft material to prevent scratching against the sides or bottom of the tub.</p><p>Aqua regia may dissolve the gold, so you&#039;ll lose Au if it is in the bath for long.&nbsp; This is also pretty</p><p>nasty stuff.[/QUOTE]</p><p><br /></p>

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