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<p>[QUOTE=&quot;ffrickey, post: 6626657, member: 20613&quot;]This is a very interesting thread.&nbsp; This is the first time I&#039;ve heard of using oxalic acid or sodium thiosulfate (Wikipedia describes it as more of a medical product).&nbsp; I think your results are very creditable.&nbsp; Can you give us any tips about which product to use when?&nbsp; You seem to use oxalic acid first and then sodium thiosulfate.&nbsp; I imagine any kind of acid helps dissolve incrustations, though it should obviously be used sparingly, but what does sodium thiosulfate do?&nbsp; This was very informative.&nbsp; Most online advice is just &quot;don&#039;t clean coins&quot;, but that&#039;s no help if you can&#039;t even make out what they are.[/QUOTE]</p><p><br /></p>

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