If humidifiers are necessary, scrub the fluid reservoirs at least twice a week to prevent mold growth. Air conditioners and dehumidifiers can also be a source of mold and should be cleaned. Quickly repair any plumbing leaks. Remove bathroom carpeting where moisture is a concern. Scour sinks and tubs at least monthly .
Fungi thrive on soap and other films that coat tiles and grout.
Fungicides may be added to paint, primer or wallpaper paste to slow fungus growth on treated areas. But this will have little effect if excess moisture remains. Clean garbage pails frequently. Clean refrigerator door gaskets and drip pans. Repair basement plumbing leaks , blocked drains, poorly vented clothes dryers and water seepage through walls.