I know at work we have airplane paint stripper, which is pretty caustic. I don't know if it would work that well on cement though. Acetone is another fairly powerful cleaning agent, we also use it to remove enamel paint.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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