If you are having trouble getting the reddish rubbery sealant off the CRT TV tube Copper coils.
Put it in the freezer for a couple of days and then take it out and while holding the coil in mid air with some pliers, bash the frozen rubbery stuff with a hammer and it will shatter into lots of tiny chunks. Almost leaving the Copper coil 100% clean.
Wear safety glasses and earmuffs (because you cannot close your ears) and do this in a easyly cleaned area, like a garage or such.
It does take 2 days, it can happen with one day, but its never as good as two days in the freezer.
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