How to treat black mold in bathroom grout myself?« Back to Previous Page

Start with a targeted cleaning solution. Mix one part distilled white vinegar with one part water in a spray bottle; for tougher growth, a small amount of baking soda paste can be scrubbed onto the grout. The acidic nature of vinegar is effective against many common household moulds. Avoid using bleach, as it only removes the surface colour and can weaken grout over time, allowing moisture to penetrate deeper.

The core issue is your bathroom's excessive humidity, a chronic problem in Dubai's climate exacerbated by a lack of windows and an underpowered fan. After showering, leave the fan running for at least 30-45 minutes to evacuate moisture. Wipe down all wet surfaces, including walls and the toilet tank, with a squeegee or towel to remove condensation. A portable dehumidifier can make a significant difference in pulling ambient moisture from the air.

If the mould returns quickly after a thorough cleaning or covers an area larger than a square meter, the growth may be more extensive behind the tiles. In such cases, a professional inspection with moisture meters and borescope cameras is needed to assess the wall cavity. Re-grouting or applying a antimicrobial sealant may be necessary for a long-term solution after the area is completely dry.