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<p>[QUOTE=&quot;TIF, post: 3268107, member: 56859&quot;]I&#039;d start with the basics-- a distilled water soak and gentle scrub, although it looks like the dirt is long gone.</p><p><br /></p><p>After that, I&#039;d soak in acetone.</p><p><br /></p><p>Next, I&#039;d do another solvent such as mineral spirits.</p><p><br /></p><p>Those two steps are in case someone put wax or other coating on there, or in cast some of the crust was glued on.</p><p><br /></p><p>After that, that hard part begins.&nbsp; A stereo microscope and proper cleaning tools would be a big help.&nbsp; It would be tempting to try a brief ammonia soak-- maybe even a brief vinegar soak (you&#039;d need to neutralize afterwards).[/QUOTE]</p><p><br /></p>

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