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The grout between the tiles in our master bathroom in Jumeirah Park has turned completely black, and there's a constant damp smell no matter how much I clean. It's been getting worse since the humidity started a couple of months ago, and I'm worried it's behind my son's recent allergies. Is it worth trying to fix this myself with bleach and a scrub, or should I just call a professional? If I hire someone, what's a reasonable price range to get this properly treated for a standard-sized bathroom?
Posted by Marco Fernandez
Asked on March 28, 2026 8:45 am
Based on your description of the grout turning completely black and the persistent damp smell in your Jumeirah Park home, this is a clear case of significant mold colonization, not just superficial staining. The Dubai climate, with its extreme humidity and constant use of air conditioning, creates a perfect environment for mold to thrive within wall cavities and underneath tiles, especially in bathrooms where condensation is common.

Attempting a DIY removal with bleach is strongly discouraged. Bleach is largely ineffective on porous surfaces like grout and can actually aggravate the problem by releasing mold spores and toxic fumes into the air, potentially worsening your son's allergy symptoms. The black discoloration indicates deep penetration, and scrubbing will not address the hidden moisture source or the root colony.

For a situation this advanced, a professional inspection is not just recommended; it is essential. Our certified inspectors use thermal imaging cameras and moisture meters to identify the exact source of the water intrusion—whether it's a leaking pipe, failed grout sealing, or condensation within the wall—and take air and surface samples to determine the spore count and species. Remediation for a standard-sized bathroom in Dubai, including proper containment, HEPA vacuuming, antimicrobial treatment, and addressing the moisture source, typically ranges from AED 1,500 to AED 4,000, depending on the extent of the damage behind the tiles.

To properly diagnose the issue and receive a precise quote, please contact our team for a comprehensive assessment. Call 800-MOLDS (800-66537) or email hello@saniservice.com. Saniservice is equipped to provide a permanent solution that protects your family's health and your property.
Posted by Sani Admin
Answered on March 30, 2026 6:42 am