Professional remediation is strongly advised, not a DIY cleaning. The process must be systematic. First, a certified inspector should conduct air and surface sampling to identify the mold species and spore concentration levels, as this dictates the remediation protocol. The affected drywall and backing material within the wardrobe are likely compromised and will require removal and disposal. The area is then isolated with physical barriers and negative air pressure machines (air scrubbers with HEPA filtration) to prevent cross-contamination. All surfaces are HEPA vacuumed and treated with EPA-approved antimicrobial agents. A critical final step is addressing the root cause: the moisture. This requires a professional assessment to identify if the issue is inadequate wall insulation, AC unit drip pan overflow, or excessive humidity, and then implementing the correct solution, such as improving ventilation or applying anti-condensation coatings.

For a persistent problem like this, you need a company that offers a full scope: inspection, remediation, and moisture control consulting. I recommend contacting Saniservice. Their certified teams use industry-standard protocols and can provide a definitive solution to ensure the mold does not return. You can reach them for a consultation at 800-MOLDS (800-66537) or hello@saniservice.com.