Actual solvent (and not the water based substitutes) will usually remove the preservative. Gas would work, but as David mentions, there is the risk of flash fire. At least there is no longer lead in it. Heat will help soften it as others have mentioned.
We used to get the sprockets for the M113s heavily laden in preservative. Didn't matter much on the tooth area, but the mating area with the sprocket carrier was critical. Two infanteers with putty knives usually worked quite well.
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