It is meant to remove the moisture or humidity in the air after a shower. This keeps mildew from forming. It also removes any unwanted odors.
Chat with our AI personalities
Normally the second switch in a bathroom is the control for the bathroom's exhaust fan. The exhaust fan removes bad odors and humidity from the bathroom, and is on the ceiling of the bathroom.
You must either have an exhaust fan or a window in the bathroom, and a range exhaust hood over the stove, or an exhaust fan that drives away any smoke, in the kitchen.
It could be mould. If you don't turn on (or you don't have) a fan in the bathroom to remove steam, condensation can be left on the walls and black mould can grow where it is wet.
Ivory Soap is in the bathroom. Iodine is in the bathroom.
We used an exterior paint on our (interior) drywall bathroom walls when we remodeled a couple years ago because we took out the window and only have the exhaust fan for ventilation. It worked well and we don't find the moisture hanging onto the wall surfaces. So far we are very happy with the results.