Black shower grout and smell: DIY fix or call professional?« Back to Previous Page

The black discoloration is almost certainly mold growth within the grout, not just on the surface. Dubai's high humidity, especially in enclosed showers, creates a perfect environment for it. Bleach only removes surface color; it cannot kill the roots embedded deep in the porous material, which is why it returns so quickly.

For a DIY attempt, skip bleach. Use a dedicated grout mold remover containing potassium hydroxide or hydrogen peroxide, applied according to the directions. Scrub with a stiff brush and ensure the area is thoroughly dried with a fan or dehumidifier afterward. Success depends on the mold's depth; if it has penetrated fully, the grout may be compromised beyond cleaning.

Given the persistent damp smell, the issue likely extends beyond what's visible. Mold can thrive behind tiles or in the wall cavity if there's a hidden moisture source like a tiny leak. In such cases, DIY cleaning is a temporary cosmetic fix.

A professional inspection is warranted to assess the moisture source and extent. They use moisture meters and borescopes to see behind walls. If the sub-surface is affected, remediation involves more than cleaning—it requires fixing the moisture problem and potentially re-grouting or sealing. For rented apartments in Jumeirah Village, confirming the extent is crucial for determining if it's a tenant maintenance or building envelope issue.