When cleaning solutions failed us, we whitened our dirty grout using a simple grout paint pen from the home improvement store.
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Tile Solutions Grout Sealer Applicator Brush Bottle with Easy Applicator Brush for No-Mess Wall Grout Sealing at, Grout Sealer Applicator
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How to Clean Floor Tile Grout in the Bathroom
Dawn + white vinegar in a spray bottle. Let sit for 5 minutes. Sprinkle baking soda on grout lines, and scrub with boiling hot water. : r/CleaningTips
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