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<p>[QUOTE=&quot;calcol, post: 2585254, member: 77639&quot;]MS-70 contains potassium hydroxide and sodium sulfonate, among other chemical goodnesses.&nbsp; I wouldn&#039;t use it on mint state or proof coins or any copper coin, but some folks have found it useful for silver and gold.&nbsp; URL for the MSDS is ww.translinesupply.com/PDF/MDSSHEETS/MS707530.MSDS.pdf.</p><p><br /></p><p>Koinsolv (n-propyl bromide) should be fine; however, I have no experience with it.&nbsp; I still use Dissolve (freon 113) as a general purpose degreaser.&nbsp; Can&#039;t buy it anymore because it&#039;s an ozone depleter.&nbsp; I redistill my precious supply.</p><p><br /></p><p>For removing PVC residue, I use tetrahydrofuran (THF).&nbsp; It&#039;s the best solvent by far for PVC and its plasticizers.&nbsp; You may never have heard of it, but if you&#039;ve ever worked with PVC pipe, you&#039;ve smelled it.&nbsp; It&#039;s the main solvent in PVC cement.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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