How to safely clean and prevent ceiling mold from AC leak?« Back to Previous Page

The black spots are likely Stachybotrys or Cladosporium mould, common from AC condensation leaks in Dubai's humid climate. For a small area (under 1 sq ft), a solution of white vinegar or a dedicated mould remover can be effective; never use bleach as it only removes the colour and not the root structure. Wear an N95 mask and gloves during cleaning to avoid spore inhalation.

However, cleaning the visible spot is only treating the symptom. The leak from the AC unit is the primary cause, and moisture has likely seeped into the ceiling material. You must have the AC unit and its drainage line serviced to stop the leak permanently. This is a non-negotiable first step.

To prevent recurrence, the affected area must be completely dried. Use a dehumidifier in the room for 24-48 hours after the leak is fixed. For porous materials like drywall or plaster, if the staining is deep or the area feels soft, the section may need to be cut out and replaced to ensure all mould roots are removed, as they can regrow from within.

Given the constant high humidity and year-round AC use in the UAE, the only way to stop it for good is to eliminate the moisture source. If the problem persists after you've addressed the leak and cleaned the area, a professional inspection with moisture meters and possibly air testing is recommended to identify hidden dampness and confirm the mould species, as some types require specific remediation protocols.