The moldy smell and the black spot indicate active growth, which bleach cannot properly remediate. Bleach only removes surface discoloration on non-porous materials but does not kill the root structure (hyphae) within porous surfaces like drywall and concrete. The moisture from the leak is feeding the mold colony, causing it to return.

In the UAE’s climate, this situation can escalate rapidly. The high humidity acts as a catalyst, allowing mold to proliferate behind the wall, out of sight. The leak itself is likely due to a clogged condensate drain line or a damaged drip pan, which needs to be professionally cleaned or repaired.

Attempting a DIY fix on the AC unit, especially one inside a closet, risks causing further water damage and spreading mold spores throughout your bedroom during the process. Proper remediation requires containment, HEPA filtration, and specialized antimicrobial agents, not bleach.

For a situation like this, where there is persistent water and visible growth, a professional assessment is critical. We would need to identify the exact source of the leak, assess the extent of the hidden moisture damage within the wall cavity, and perform a hygienization protocol to ensure it is safely and completely resolved.

Call our team at 800-MOLDS (800-66537) or email hello@saniservice.com for an immediate inspection. Let’s get that contained before it affects your health and property.