How to clean and prevent black mold from AC drip?« Back to Previous Page

The black speckles are likely Cladosporium or another common household mould, feeding on the moisture from the AC drip. In Dubai's high humidity, this is a frequent issue that requires immediate attention to prevent structural damage and potential health irritants.

For a small area, you can clean it yourself. Wear an N95 mask and gloves. Mix a solution of one part white vinegar to four parts water. Scrub the affected skirting board and wall with this solution, then wipe dry. Do not use bleach, as it only removes the colour and can push mould roots deeper into porous surfaces. The key is to eliminate the moisture source completely.

Prevention is entirely dependent on stopping the AC drip. This is often caused by a clogged condensate drain line, which is common here due to dust and microbial growth inside the unit. Turn off the AC, locate the drain pipe (usually a white PVC pipe exiting the wall), and check if it's dripping slowly or not at all. You can attempt to clear it by pouring a cup of distilled vinegar down the drain line access point.

However, if the mould covers more than one square meter, has a musty odour, or the drip persists after your attempt to clear the line, a professional inspection is strongly advised. They can conduct a proper diagnosis, often with a borescope camera, to identify blockages or damage deep within the AC unit and ducting that you cannot see. For long-term prevention, consider an annual AC and duct deep-cleaning service before the peak summer season to keep the condensate system flowing freely.