Try either toulene or xylene. Both chemicals are very potent, make sure you have very good ventilation. Definitely test on a small area. Good luck.
PS: xylene is the only thing I've found that removes urethane based caulking when it's not cured.
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"The gift of liberty is like that of a horse, handsome, strong, and high-spirited. In some it arouses a wish to ride; in many others, on the contrary, it increases the desire to walk."
-- Massimo d'Azeglio
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