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<p>[QUOTE=&quot;iPen, post: 2985583, member: 69760&quot;]Here&#039;s an article by Walter Breen back in 1977 that talks about the procedure for tarnish removal for proofs - not sure how that translates for cloudy coins. Breen mentions (clear or cloudy) ammonia followed by MEK for nickels and gold coins, and typically MEK by itself for silver proof coins. I haven&#039;t tried either, so I can&#039;t attest to whether or not they&#039;ll remove the clouding on your proofs. But, maybe others can speak to Breen&#039;s claims.</p><p><br /></p><p><a href="https://www.pcgs.com/books/breen-proofs/ToTheReader-002.aspx" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.pcgs.com/books/breen-proofs/ToTheReader-002.aspx" rel="nofollow">https://www.pcgs.com/books/breen-proofs/ToTheReader-002.aspx</a>[/QUOTE]</p><p><br /></p>

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