Here are some tips on how to clean popcorn ceilings remove cobwebs stains and discolorations and return them to their mid 20th century glory.
Mildew stains on popcorn ceiling.
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.
Combine 1 part bleach with 5 parts water and gently dab the mixture onto the stains using a soft cloth.
Lightly mist the area to prevent.
Also depending upon how much mold or mildew it is that you have.
Repeat the process as needed to completely.
Water mildew and smoke stains.
Lightly mist the area to prevent additional water damage.
Other than aesthetic purposes mildew removal is necessary to prevent the spores from spreading and further contaminating the bathroom.
To prevent mold regrowth coat your ceiling with a stain killing primer then paint over it with a mildew resistant.
But many popcorn ceilings remain and those that do need cleaning by now.
A leaky roof may cause yellow water marks or mildew to form on a your popcorn ceiling.
Many homeowners got rid of their popcorn ceilings in the half century since they were all the rage.
If the ceiling holds up to the liquid test you can remove the yellow stains and mildew using a bleach solution.
If your ceiling is moldy you may have a water leak in it or behind the walls.
Humid air and poor ventilation contribute to mildew growth on bathroom ceilings.