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<p>[QUOTE=&quot;Roman Collector, post: 2655587, member: 75937&quot;]In many cases, the crud is held together by proteinaceous, organic material that is amenable to being dissolved by enzymes (proteases). I would get a box of contact lens enzymatic cleaner at the drug store and prepare it as directed according to the directions on the box. As if they were contact lenses, insert the coins in the little containers for the cleaner and leave them soak 12 hours or so. Brush to loosen up the crud, then rinse and then soak in distilled water for 1-2 days, changing the water a couple times a day and brushing the coins with each water change. This will not hurt the patina at all.[/QUOTE]</p><p><br /></p>

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