A dehumidifier may be necessary The way to kill it is to use ammonia
in a spray bottle, rather than bleach
. You have to do an area no larger than two by two foot at a time. When you are ready to leave the house, open the windows in the area of the mold, take a deep breath, hold it, go in and spray an area 2 ft. by 2 ft. Leave still holding your breath. Don't get any in your eyes. Never EVER use bleach and ammonia together. The two create poison gas.