Place a stepladder beneath the area of the mold on the ceiling.
Fill a spray bottle with white vinegar.
Put on gloves. Wear goggles to ensure that the vinegar doesn’t get into your eyes.
Climb the ladder. Spray the white vinegar on the mold stain and let it sit for 20 minutes.
Scrub the mold with a brush until the stain is gone.
Dip a cloth in water and rub it over the cleaned area. Dry the ceiling with a clean towel.