[Bonanza]

I agree with you, Anne. I sincerely doubt that Goof Off will do the job, although I love the stuff for other things. You might try Clorox's "Clean Up" or "Simple Green" using a very stiff scrub brush (both are also excellent for mopping tile floors). Scrubbing with regular bleach should work and if all else fails, muriatic acid. Be aware however, the acid must be used with extreme caution as it is very caustic. Good luck!