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One thing I found good for piece of mind was to heat it up nice and hot and poor it through some muslin. It comes out like new. I always get bits of tin foil and plaster in mine and the muslin removes it very well.
I always add a teaspoon or so of turps to keep it soft each time I heat it up. Some times I'll pull a bit out cool it off and test it with the finger nail test.
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