While a small patch might be addressed with a DIY solution like diluted bleach, your situation—characterized by spreading and location behind a large fixture—warrants extreme caution. DIY cleaning often addresses only surface growth, leaving the root cause (moisture) and hidden contamination within the wall unresolved. Disturbing it improperly can aerosolize harmful spores, significantly worsening indoor air quality and potentially affecting your AC system as the spores circulate.

For a villa in Al Barsha, professional remediation is strongly advised. A certified inspection, including moisture mapping and air quality testing, is crucial to determine the full extent. Costs vary based on the infestation’s severity and wall cavity involvement, but for a contained area like this, you could be looking at a range from AED 1,500 to AED 4,000 for complete remediation, moisture control, and hygienization.

Attempting this yourself risks inadequate treatment and health issues. We strongly recommend a professional assessment. For an accurate quote and to ensure it’s handled according to Dubai Municipality standards, call our experts at 800-MOLDS (800-66537) or email hello@saniservice.com.