If your ceiling is moldy you may have a water leak in it or behind the walls.
Mildew stains on popcorn ceiling.
Other than aesthetic purposes mildew removal is necessary to prevent the spores from spreading and further contaminating the bathroom.
Zinzer makes several types.
Mix water with bleach in a spray bottle and apply to the ceiling.
Lightly mist the area to prevent.
Here are some tips on how to clean popcorn ceilings remove cobwebs stains and discolorations and return them to their mid 20th century glory.
A leaky roof may cause yellow water marks or mildew to form on a your popcorn ceiling.
But many popcorn ceilings remain and those that do need cleaning by now.
Lightly mist the area to prevent additional water damage.
Many homeowners got rid of their popcorn ceilings in the half century since they were all the rage.
Also depending upon how much mold or mildew it is that you have.
If its just a darkening of the ceiling and its really only a sand texture you can clean the surface using a bleach and water solution to remove any loose mold growth let dry then paint using a good quality mold resistant primer.
Mildew is a fungus that contains a musty odor and appears as multicolored spots on ceilings.
Humid air and poor ventilation contribute to mildew growth on bathroom ceilings.
To prevent mold regrowth coat your ceiling with a stain killing primer then paint over it with a mildew resistant.
Repeat the process as needed to completely.