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<p>[QUOTE=&quot;physics-fan3.14, post: 3261444, member: 19165&quot;]I&#039;m not Doug, but I&#039;ll answer anyways.... </p><p><br /></p><p>Running under water will really only help if the gunk is very loosely adhered. You could apply high pressure to it, but then you run the risk of more damage than the qtip. </p><p><br /></p><p>Your best bet is going to be soaking, and then using a qtip carefully. The soak should loosen anything, and then a careful qtip application should remove the gunk. </p><p><br /></p><p>I&#039;d hesitate to recommend agitation, especially vigorous agitation, for the very reason you mentioned: they are sliding around on the surface of the container, they are bumping into each other, and the particles that have been removed are also floating around in there. Shaking a container is far more likely to damage the coin than the careful use of a qtip![/QUOTE]</p><p><br /></p>

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