Your situation—recurring mold behind wardrobes and a child’s improving cough away from home—strongly indicates a deeper issue that wiping cannot fix. This is extremely common here; the constant AC use against our high humidity creates significant condensation in cooler, stagnant spaces like behind furniture. This moisture wicks into the plaster and blockwork, creating an embedded food source.

Vinegar or bleach only treats the surface discoloration, which is why it returns darker and stronger. Effective remediation requires three steps: identifying the moisture source with specialized tools, physically removing the contaminated porous materials (e.g., damaged drywall or insulation), and treating the area with hospital-grade disinfectants that leave no harmful residues. The most critical part is the post-remediation verification (PRV), a follow-up lab test to confirm spore counts inside the contained work area have returned to normal outdoor levels. Always request this documentation.

For companies, ask specifically about their containment procedures to prevent cross-contamination and the safety data sheets (SDS) for the products they use. Reputable firms will transparently discuss both. The entire process for two bedrooms typically requires several days to properly dry and should include actionable advice on humidity control to prevent recurrence.