For cleaning, use a soft, dry cloth to gently wipe away any surface mold. For persistent spots, lightly dampen a cloth with a 50/50 solution of water and isopropyl alcohol or distilled white vinegar and gently dab the area—test this on an inconspicuous spot first. Never saturate the leather. After cleaning, allow the bags to air dry completely away from direct sunlight or heat, then condition them with a leather-specific product to restore moisture.

The root cause is the AC unit’s condensation leak, a very common issue in Dubai’s climate where ACs run constantly. The leak is likely due to a clogged condensate drain line or a damaged drain pan. You can try pouring a cup of distilled white vinegar down the drain line access point to clear a minor clog. For a recurring or significant leak, a professional HVAC inspection is necessary to properly clear the line, check the drain pan, and ensure the unit is draining correctly as per Dubai Municipality guidelines.

Since the mold is active, a professional assessment can also confirm the area is properly dried and treated to prevent its return, which is crucial for protecting your belongings and indoor air quality in a confined space like a closet.