This air will absorb moisture quickly. Vacuum the entire house and immediately discard the disposable bags. Steam clean all carpets and dry quickly. Discard potential sources of molds such as accumulations of old newspapers, boxes, and clothing. The disinfectant recommended for mold removal is a solution of one part bleach to two parts water.
Commercial disinfectants are also available through janitorial supply stores.
Use a household or garden sprayer and spray all surfaces that have been touched by flood water or have been soaked by water from some other source. Use a brush or broom to force the solution into crevices. Mechanical filters that use standard disposal fiberglass filters should be changed monthly. Permanent filters with baffles should be cleaned periodically. An electrostatic precipitator is an electric filter.