Introduction Dirty grout makes floors look dull and can trap mold or moisture. Most people are searching for quick solutions for stains, yellowing, or black mold. Here’s the simple answer: Sweep the floor, apply a safe cleaner (like baking soda paste or vinegar on unsealed grout), scrub with a stiff brush, rinse, and dry. You’ll see brighter grout in 30–60 minutes. For lasting results, seal the grout and...