EPA ‐ Mold Remediation/Cleanup and Biocides
The purpose of mold remediation is to remove the mold to prevent human exposure and damage to building materials and furnishings. It is necessary to clean up mold contamination, not just to kill the mold. Dead mold is still allergenic, and some dead molds are potentially toxic. The use of a biocide, such as chlorine bleach, is not recommended as a routine practice during mold remediation.
With traditional methods of mold remediation, it is not possible or desirable to completely sterilize an area; a background level of mold spores will remain in the air (roughly equivalent to or lower than the level in outside air).
Traditional disinfectants or biocides require that the area is always ventilated. Outdoor air may need to be brought in with fans. However, fans can potentially distribute mold spores throughout an unaffected area. In addition, understand that biocides are toxic to humans, as well as to mold.