DIY fix or professional for black shower grout and smell?« Back to Previous Page

Black grout and a persistent earthy smell in a windowless bathroom point to active mould growth, a common issue in Dubai due to the high humidity and constant AC use creating condensation. The smell indicates it's likely more than surface-level, possibly growing behind the tiles or in the wall cavity from a hidden moisture source.

For a small, isolated patch, a DIY approach can be tried. Use a dedicated mould-removing cleaner or a solution of white vinegar or diluted bleach. Scrub thoroughly and ensure the area is completely dried afterwards. However, given the persistent smell and the fact it's in a sealed, high-humidity environment, the problem is often more extensive than it appears. The moisture source could be a tiny crack in the grout, a failed sealant bead, or even a small plumbing leak from the shower mixer behind the wall.

If the mould returns within a few weeks after a thorough cleaning, you need a professional assessment. They use moisture meters and borescopes to locate the source of the dampness without unnecessary demolition. In many Dubai apartments, resolving this requires not just cleaning but also regrouting with a fungicidal additive, resealing with high-quality silicone, and improving ventilation, possibly by installing an extractor fan if one is insufficient. A professional inspection will determine if the wall itself needs to be dried or treated to prevent recurrence.