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There were a couple of threads on the H.A.M.B. about this a while ago. One guy insisted that liberal doses of
regular (not diet) Coke would free them because of the combination of carbonation and acid. Another filled the valley with charcoal, lit it up, and covered it with a piece of sheet metal and kept it going a couple of days. He claimed it worked fine. I'd try some of the alternative methods before resorting to brute force.