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Have you tried a bleach based cleaner and did you allow it time to sink in before scrubbing it out? Please give us details about what you already have done, that did not work.– RMDmanCommented Nov 25 at 14:30
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2This question is similar to: Best way to remove grout stains in shower?. If you believe it’s different, please edit the question, make it clear how it’s different and/or how the answers on that question are not helpful for your problem.– isherwoodCommented Nov 25 at 14:41
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1Also How do I treat mold and mildew in shower grout?.– isherwoodCommented Nov 25 at 14:41
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