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<p>[QUOTE=&quot;John Burgess, post: 7496913, member: 105098&quot;]very popular in the 50s,60s,and 70s, a soft fine animal hair bristled jewelers brush.</p><p><br /></p><p>a good long soak in acetone, or distilled water, whatever you want or are more comfortable with,&nbsp; in order to soften up the gunk and then a light gentle brushing with this very specific brush type. no nylon, no cotton, no fabric, no metal bristles, or wood, Animal hair bristled jeweler&#039;s brush. don&#039;t brush too hard or too much, just a light brushing, a couple of times tops.</p><p><br /></p><p>any other brush material or cloth is going to be some sort of polymer or even cotton, it&#039;s mostly cellulose, which is used to make polymers.</p><p><br /></p><p>The old timers that collect early coppers and are attempting to preserve them as best as possible, swear by a hair bristled brush and mineral oil and only that in order to clean up verdigris on them and preserve their coins.</p><p><br /></p><p>Do not use tap water which may have a high or low pH but WILL have chlorine or fluoride.</p><p><br /></p><p>I&#039;d go this type of route if I were in your position. I wouldn&#039;t mess with wood and pick at things, just seem like it would work but possible to do more harm than good if you aren&#039;t sure of what you are doing.</p><p><br /></p><p>give it a soak and a couple gentle swipes on the brush and give it a rest then try again, eventually it will get knocked off and not damage the surfaces and further than they already are.[/QUOTE]</p><p><br /></p>

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