First, contain the area to prevent spores from spreading. Avoid disturbing the mold. For a small patch (less than one square meter), you may clean it yourself using a solution of detergent and water, then thoroughly dry the area. However, since the mold is on both the wall and a porous mattress, this is a more serious case that likely requires professional assessment.

The mattress is probably not salvageable. For the wall, the underlying cause must be identified—it could be a hidden pipe leak or simply severe condensation from the humidity differential. A professional inspection is recommended to determine the moisture source and the extent of the contamination, which is often deeper than what’s visible.

For reliable cleanup, look for a company that provides a full process: identifying the moisture source, containing the area, physically removing the mold, and verifying cleanup success with post-remediation testing. In the UAE, reputable providers should be able to explain their methodology and show certifications. You can call 800-MOLDS (800-66537) for a science-driven inspection and remediation plan. After cleanup, use a dehumidifier and ensure constant air circulation, especially behind large furniture, to prevent recurrence.