Black grout in shower, clean or call professional?« Back to Previous Page

The black discoloration in your shower grout and ceiling is almost certainly mold, exacerbated by Dubai's high humidity and the poor ventilation common in older Bur Dubai buildings. Bleach only removes surface discoloration but doesn't address the root cause, which is why it returns so quickly.

For a small, surface-level patch, you can attempt a more targeted approach. Use a dedicated grout cleaner or a paste of baking soda and hydrogen peroxide. Scrub thoroughly and, crucially, run a dehumidifier or a powerful exhaust fan for at least an hour after every shower to keep the area dry. This is the most critical step.

However, given that it's spreading to the ceiling—a porous material—the mold has likely penetrated beyond the surface. This indicates a persistent moisture issue that DIY cleaning cannot resolve. In such cases, a professional inspection is warranted to assess the extent of the growth, identify any hidden moisture sources (like a small pipe leak or condensation within the wall), and perform remediation that includes antimicrobial treatment to prevent regrowth. For a science-driven approach, a company with its own microbiology lab can test a sample to identify the mold species, which dictates the correct removal protocol.