AC mold returning after bleach: DIY or call professional?« Back to Previous Page

The black spots returning after bleach treatment indicate active mold growth, likely due to the ongoing moisture from your AC leak. Bleach only removes surface discoloration on porous materials like drywall; it doesn't kill the root structure embedded within.

In Dubai's high humidity, this persistent dampness creates an ideal environment for mold to regrow quickly. The core issue is the water intrusion. You must first fix the AC condensate drain line or pan leak to stop the moisture source.

For a small area (less than one square meter), you can attempt DIY by addressing the leak, allowing the wall to dry completely, then scrubbing with a detergent solution. However, given the regrowth and potential for hidden spread inside the wall cavity behind the vent, a professional assessment is strongly recommended. They can identify the full extent of the contamination and use appropriate antimicrobial solutions and techniques to treat it properly. For rental properties, Dubai Municipality regulations often place responsibility on the landlord to fix issues leading to indoor dampness and mold, so notifying them is a good first step.