How to stop AC leak and kill mold for good?« Back to Previous Page

The black spots are likely mold growth fueled by the constant dampness from your AC leak. In Dubai's high humidity, this is a common issue where condensation or a clogged drain line creates a perfect environment for mold.

First, address the water source. The most common cause is a blocked condensate drain line. Locate the drain pipe (usually a white PVC pipe exiting the wall near your outdoor unit) and check for flow. You can attempt to clear a minor clog by pouring a mixture of warm water and distilled vinegar down the drain line access point. If the leak persists, the issue could be a dislodged drain pan or a more significant blockage requiring a technician to vacuum the line.

Once the leak is permanently stopped, you must tackle the mold. Merely wiping the surface is not enough, as the hyphae (root structure) penetrate porous materials like wood and drywall. For small, surface-level spots on a non-porous baseboard, scrubbing with a microfiber cloth and a solution of diluted detergent or isopropyl alcohol can be effective. Ensure the area is completely dried afterward.

However, if the mold returns after cleaning or the carpet underneath is damp and stained, the growth is likely more extensive inside the wall or under the carpet pad. This is a serious case where professional inspection is recommended. They can use moisture meters and borescopes to assess the hidden damage. Remediation involves removing and replacing contaminated porous materials, not just surface cleaning, to kill it at the source. In the UAE, reputable providers follow standards like the IICRC S520 for proper mold remediation.

To prevent recurrence, ensure your AC unit is serviced regularly to keep the drain line clear and maintain proper refrigerant levels, as an overworked unit produces more condensation. Keeping indoor humidity below 60% with a dehumidifier can also help.