Can I fix recurring shower mold or call a professional?« Back to Previous Page

The grout between the tiles in my shower has been getting these black spots for the last couple of months, and the musty smell hits me every time I open the bathroom door. It’s my ensuite bathroom in my apartment in Jumeirah Lakes Towers, so there’s no window for ventilation. I’ve tried scrubbing it with bleach, but it just comes back after a few days. Is this something I can fix myself with a stronger cleaner, or is it time to call in a professional?
Posted by Nada Sharif
Asked on March 20, 2026 5:13 pm
Based on your description of recurring black spots and a persistent musty odor in your ensuite bathroom in Jumeirah Lakes Towers, this is a classic case of a chronic mold issue exacerbated by the Dubai climate. The high humidity and constant use of air conditioning create significant temperature differentials, leading to massive condensation on cold surfaces like tiles and grout. This moisture, combined with organic matter (soap scum), provides an ideal breeding ground for mold.

While bleach can remove surface discoloration, it is a ineffective biocide that does not address the root cause or kill the hyphae (roots) penetrating the porous grout. This is why the growth returns so quickly. In a windowless bathroom, the lack of natural ventilation and sunlight creates a perpetually damp environment that mold thrives in.

For a temporary measure, I recommend using a dedicated EPA-approved fungicidal cleaner, not bleach, and rigorously improving ventilation by running the exhaust fan for at least 30 minutes after every shower and wiping down wet surfaces. However, given the recurrent nature and the presence of a systemic odor—which often indicates a more established colony—this situation likely requires professional assessment.

Our certified inspectors use moisture meters and borescopes to detect hidden moisture within walls and behind tiles, which is common in such cases. Remediation involves not just surface cleaning but addressing the underlying humidity problem to achieve a permanent solution. For a comprehensive inspection and a definitive resolution to prevent further damage and potential health impacts, I strongly advise contacting our team at Saniservice. Call 800-MOLDS (800-66537) or email hello@saniservice.com for a professional evaluation.
Posted by Sani Admin
Answered on March 23, 2026 12:48 pm