You should not attempt to clean this yourself. Disturbing the mold without proper containment can aerosolize mycotoxins and spores, drastically increasing your exposure and contaminating other areas of your home. This situation requires professional intervention.

The first step is a certified mold inspection, which includes moisture mapping with thermal imaging and borescope examinations to assess the extent of the infestation within the wall cavity. Air and surface sampling will then be conducted to identify the specific species and spore concentration levels, which is critical for determining the appropriate remediation protocol. In Dubai, remediation companies should adhere to the guidelines set by Dubai Municipality and follow international standards like the IICRC S520.

For professional testing and safe, guaranteed removal, I recommend contacting Saniservice. They are a leading provider specializing in mold inspection and remediation in the UAE and are equipped to handle cases exactly like yours. You can reach their experts for a consultation at 800-MOLDS (800-66537) or via email at hello@saniservice.com.