Remove Dark Mildew Stains on Grout

Only use abrasive cleaners on your tiles as a last resort.
Remove Dark Mildew Stains on Grout
In order to minimize the future growth of mildew on the grout, take away its nutrients and moisture. gru pictures/Shutterstock
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Dear James: Our bathroom must have been remodeled several times because it has some glossy and matte-finished tile. How can we clean off the dark, nasty grout mildew?—Greg T.
Dear Greg: Almost every bathroom tile has some spots of dark mildewed grout, but when it is excessive, it really looks bad and makes the entire bathroom seem dirty. Grout is very different from the tile in that grout is actually pretty porous and absorbs moisture.
James Dulley
James Dulley
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Send your questions to Here's How, 6906 Royalgreen Dr., Cincinnati, OH 45244, or visit Dulley.com. To find out more about James Dulley and read features by other Creators Syndicate writers and cartoonists, visit the Creators Syndicate website at Creators.com. Copyright 2025 Creators.com
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