How to safely remove black mold from closet after AC leak?« Back to Previous Page

A common issue here in Dubai, and your concern is valid. That black patch is likely Stachybotrys chartarum or Aspergillus niger, both of which thrive in the persistent humidity and condensation from AC systems. Even after fixing the leak, residual moisture within the wall cavity and spores in the air pose a health risk, as your allergy symptoms suggest.

For a small patch (under 1 square foot), you can attempt containment and removal. First, isolate the area: seal the closet with plastic sheeting. Wear an N95 respirator, nitrile gloves, and eye protection. Do not use bleach; it is ineffective on porous surfaces and can exacerbate respiratory issues. Instead, use a commercial biocide approved by the UAE's Ministry of Climate Change and Environment (MOCCAE), or a solution of distilled white vinegar and water. Scrub the area thoroughly. After cleaning, the surface must be dried completely using a HEPA-filtered air mover or dehumidifier—crucial in our climate to prevent immediate regrowth.

However, the primary risk is not the visible growth but the hidden contamination. Spores will have aerosolized, and moisture likely wicked into the drywall and insulation behind. DIY cleaning only addresses the surface, leaving the root cause untreated. In the UAE, proper remediation requires specialized equipment like negative air machines and HEPA scrubbing to contain and purify the air, preventing cross-contamination.

Given your allergy symptoms and the high probability of hidden mold, a professional inspection is strongly advised. We use thermal imaging and borescopes to assess the wall cavity and air testing to determine spore counts. For a guaranteed solution and to ensure your indoor air quality is safe, contact our team at Saniservice for an assessment. Call 800-MOLDS (800-66537) or email hello@saniservice.com.