If humidity is to high condensation forms on the coldest spot , that
just happens to be the outside wall. Wet clothes make it worse. Mold is
mildew and bleach will kill it. But why have a humidifier in there at
all, you dont need one do you. you can introduce a whole new set of
issues and problems with to humid air. You have not shown that a
humidifier is necessary by any reliable means. Uncalibrated humidistats
are considered unreliable means.