How do I clean mold and mildew from bathroom grout?

Because grout is highly porous and bathrooms are naturally warm and damp, tiled surfaces are prime breeding grounds for mold and mildew. Mold does not just look unsightly; if left to grow unchecked, it can release spores that irritate your respiratory system and permanently discolor or degrade your grout lines. Cleaning bathroom grout requires a method that penetrates the porous cement to kill the mold spores at their root, combined with mechanical scrubbing to lift the stains.

For a gentle, natural cleaning solution, start by mixing baking soda with water to form a thick paste. Apply this paste directly onto the affected grout lines and let it sit for ten minutes. Next, spray the area with a mixture of equal parts white vinegar and water. The chemical reaction between the baking soda and the acidic vinegar will fizz, helping to loosen stubborn dirt and mold. Scrub the grout thoroughly in a circular motion, then rinse with warm water. For deep-seated, stubborn black mold, a stronger solution of one part liquid household bleach mixed with ten parts water is highly effective at sanitizing and whitening the grout.

To make this chore significantly easier and avoid damaging your tiles, invest in a specialized scrub brush rather than relying on an old toothbrush. A stiff, angled grout cleaning brush is designed to fit directly into the narrow channels between tiles, providing maximum leverage and scrubbing power without fraying. Once your grout is clean and completely dry, applying a commercial grout sealer once a year is the single best way to protect the porous surface from absorbing moisture and prevent mold from returning.