Should I clean these black dots myself with bleach?« Back to Previous Page

Given Dubai's high humidity and your wall's exterior-facing position, those black dots are likely mold from condensation or a minor leak. Bleach is not recommended; it only removes surface discoloration and can worsen the problem by adding moisture to the porous wall material, allowing the roots to regrow.

For a small, surface-level patch (under one square foot), you can clean it yourself with a dedicated mold remover spray or a solution of distilled white vinegar and water. Wear an N95 mask and gloves. Scrub gently, let it dry completely, and monitor the spot. However, if it returns quickly, smells musty, or you see any water staining on the wall, the issue is inside the structure.

In this case, with the growth hidden behind items and on an exterior wall, a professional inspection is advised to identify the moisture source—often a leaking pipe, capillary action from the slab, or condensation within the wall cavity. They use moisture meters and thermal cameras to find the origin. Simply cleaning the visible growth without fixing the water issue will lead to immediate recurrence and potential structural damage. Lab testing can also identify the species, which is important for determining the correct remediation protocol, especially if anyone in the household has respiratory sensitivities.