I have used elbow grease, vinegar and a kitchen scrubby with success several times. Also, lime away can be of some help, but make sure it is sealed in the grout lines first so you don't remove that as well. (12/10/2008)
Carefully scraping, using a single edge blade, is best. It takes a long time and you must be sure not to scrape into the ceramic/fiberglass surfaces. The results are worth the effort though. (12/11/2008)
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