First, for your family’s safety, wear an N95 mask and gloves during any cleaning. Isolate the area from children and pets. For a small patch, a solution of white vinegar or a diluted bleach mixture (1 part bleach to 4 parts water) can be effective. Scrub the area gently, but avoid simply painting over it, as the mould will return.

However, the location behind a wardrobe is a significant concern. The furniture traps humid air against the cooler wall, creating a perfect breeding ground. Merely cleaning the surface is a temporary fix. The mould may have penetrated the plasterboard or insulation, requiring professional assessment and remediation to ensure it is thoroughly removed and to assess potential structural damage.

The root cause is excess humidity. In Dubai’s climate, this is often due to inadequate ventilation or an AC system not operating efficiently as a dehumidifier. To prevent recurrence, improve air circulation behind the wardrobe, ensure your AC is serviced and draining properly, and consider using a dehumidifier in that room. For a confirmed and recurring issue, a professional inspection with lab analysis of the mould type is the most reliable path to a permanent solution.