If your ceiling is moldy you may have a water leak in it or behind the walls.
How to treat mildew on popcorn ceiling.
Using a brush scrub at the area of mold which has been sitting in the vinegar.
They were a quick cheap way to finish ceilings in tract homes and apartment buildings.
Builders sprayed a stucco mixture on the ceiling that had a lumpy cottage cheese like texture.
Mildew is a fungus that contains a musty odor and appears as multicolored spots on ceilings.
Popcorn ceilings were inescapable from the 1950s to the early 1980s.
To prevent mold regrowth coat your ceiling with a stain killing primer then paint over it with a mildew resistant.
Also depending upon how much mold or mildew it is that you have.
Using a scrub brush will make it easier to break up the mold as well as keeping your skin further removed from the vinegar while you are cleaning.
You will have to remove the affected portion of ceiling and replace it.
Examine the material used to construct the ceiling.
Humid air and poor ventilation contribute to mildew growth on bathroom ceilings.
Other than aesthetic purposes mildew removal is necessary to prevent the spores from spreading and further contaminating the bathroom.
If any kind of porous material popcorn wood drywall etc has been used on your ceiling then you will not be able to clean it properly.
Zinzer makes several types.
Scrub the mold away with warm water and a scrub brush.
The mold will simply come back quickly later.