How to fix AC leak and remove black mold on wall?« Back to Previous Page

The immediate priority is stopping the AC leak, which is the source of the moisture. In Dubai's climate, this is often caused by a clogged condensate drain line from dust and biofilm buildup. A full system service to clear the drain pan and line is the permanent fix, not just a water collection pan. The unit should be checked for proper insulation on the refrigerant lines to prevent condensation, a common issue with high humidity.

For the wall, the visible mold is likely just the surface growth. On a painted surface, a solution of diluted detergent (like a few drops of dish soap per liter of water) can be used to wipe the area. Never use bleach, as it doesn't kill the roots and can damage paint. Dry the wall completely with a fan after cleaning.

However, with a persistent leak over weeks, moisture has likely penetrated the gypsum board behind the paint. This hidden mold cannot be surface-cleaned and is the real health concern. The wall may need to be opened to inspect and replace any compromised material. For a situation involving structural elements and potential hidden growth, a professional inspection with moisture meters and, if necessary, lab analysis of a tape-lift sample is the only way to verify the full extent. This is the standard for science-driven remediation to ensure it doesn't just come back.