The best approach to mould removal depends on the size and surface type. For small areas under 10 square feet, homeowners can typically handle removal themselves using household methods [1]. Start by cleaning with detergent and water as the primary step, as this physically removes mould, biofilm, and organic material that protect spores [1]. For non-porous surfaces like tile and glass, you can follow up with a disinfectant: a 1:10 bleach-to-water solution (1 cup bleach per gallon of water) is effective, or alternatively 3% hydrogen peroxide or undiluted white vinegar [1]. Each option kills mould effectively, though vinegar works best on certain surfaces and may be less reliable on heavy contamination. Never mix bleach with ammonia or other cleaners, as this produces toxic fumes.

For porous materials such as carpet, drywall, ceiling tiles, and upholstered furniture, extensive mould usually cannot be reliably cleaned and should be discarded [1]. Always wear protective equipment including an N95 respirator, goggles, and non-porous gloves to avoid inhaling spores [1]. Ensure good ventilation by opening windows and doors during cleaning.

After cleaning, dry the area completely within 24 to 48 hours using fans or dehumidifiers, as residual moisture enables rapid regrowth [1]. Post-cleaning, use HEPA vacuums to capture settled spores and replace HVAC filters if needed [1]. The most critical long-term step is identifying and fixing the moisture source—whether a leak, poor ventilation, or condensation—because mould will return if the environment remains damp [1]. Maintain indoor humidity below 50% (ideally 30–50%) to prevent regrowth [1]. For large infestations, mould in HVAC systems, mould from sewage or contaminated water, or if you have health vulnerabilities, hire a licensed professional remediation specialist [1].