How to remove and prevent black mold after AC leak?« Back to Previous Page

Black mold after an AC leak is a common issue here due to our high humidity, which allows it to regrow if not handled correctly. Since the leak is fixed, the priority is proper removal and addressing the hidden moisture in the wall.

For a small patch on a painted surface, wear an N95 mask and gloves. Do not just wipe it, as this spreads spores. Use a solution of one part distilled white vinegar to one part water or a dedicated mold-cleaning product. Scrub the area thoroughly, then let it dry completely. Repainting alone will not work; you must use a mold-inhibiting primer before applying new paint.

Stopping it for good requires ensuring the wall itself is dry. AC leaks often seep into the gypsum board and insulation behind. This hidden moisture is the real problem. Even with the leak fixed, the wall cavity can stay damp for weeks, fueling regrowth. Use a moisture meter to verify the wall is completely dry down to its core before any repainting.

For any recurring mold or if the affected area is larger than a square foot, a professional inspection is recommended. They can use borescopes to check inside the wall for hidden growth and confirm the drying process was successful. In Dubai's climate, preventing its return also means maintaining low indoor humidity, ideally between 45-55%, with a dehumidifier if necessary.