How to treat potential black mold from AC leak?« Back to Previous Page

Stop the leak first. Turn off the AC unit at the circuit breaker to prevent electrical hazards and further water damage. The most critical step is to identify and repair the source of the leak, which is often a clogged condensate drain line—a very common issue in Dubai due to dust and high AC usage.

Dry the area thoroughly. Use a wet/dry vacuum to remove all standing water. Then, place a powerful dehumidifier and fans directly at the wall and carpet for at least 48-72 hours. In our humidity, surfaces must feel completely dry to the touch, and a moisture meter reading below 16% is the goal to prevent regrowth.

For the visible black specks, wearing an N95 mask and gloves, scrub the affected wall area with a detergent solution (like diluted dish soap) and a stiff brush. Do not use bleach, as it does not kill mould penetratively and can worsen indoor air quality. After scrubbing, wipe the area with a diluted white vinegar solution, which is more effective at penetrating porous materials.

Be aware that the mould you see is likely just the surface growth; the main colony thrives inside the wall cavity where it’s damp. This hidden growth is the real concern. If the dampness has persisted for weeks, or if the wall is still moist after drying efforts, a professional inspection is strongly advised. They use borescopes to see inside walls and air quality tests to identify spore types and concentrations, as what’s termed "black mould" can be several species with varying implications. DIY methods can address surface issues, but hidden moisture requires professional-grade drying equipment and remediation protocols to ensure it is resolved.