How to clean black mold from humid closet walls?« Back to Previous Page

Based on the description of small black spots in a closet corner, this is a classic case of surface mold growth, likely Cladosporium or Aspergillus, fueled by the high humidity since turning off the AC. This is extremely common in Dubai's climate, where ambient humidity can quickly lead to condensation on cooler interior surfaces, especially in enclosed, poorly ventilated spaces like closets.

For a small, contained area like this, a DIY approach may be sufficient. Your first step is personal protection: wear an N95 mask, gloves, and safety glasses. Do not attempt cleaning without this basic PPE. Increase ventilation in the room by opening windows if the outside humidity is low, otherwise use a fan.

The most effective and approved cleaning solution for non-porous surfaces like painted walls is a mixture of detergent and water. Avoid bleach, as it only removes the colour and not the underlying fungal structure, and its fumes can be hazardous indoors. From a store like ACE or Carrefour, purchase a neutral pH detergent or a specific fungicidal cleaner designed for building materials. Apply the solution with a cloth, scrubbing gently. After cleaning, the area must be dried completely within 24-48 hours using a fan or dehumidifier to prevent immediate regrowth.

However, this only addresses the visible growth. The underlying cause is the elevated humidity. To prevent recurrence, you must control the moisture. Leaving the closet doors ajar for airflow, using a small desiccant dehumidifier inside the closet, or occasionally running the AC in dry mode is essential.

If the mould covers an area larger than one square meter, has a persistent musty odour, or if you suspect it has penetrated the wallboard, professional assessment is strongly advised. Improper handling can aerosolize spores and spread the contamination. For a certified inspection and definitive remediation to ensure the problem is resolved at its source, I recommend contacting Saniservice. Their experts can conduct moisture mapping and air quality testing. Call 800-MOLDS (800-66537) or email hello@saniservice.com for a consultation.