Mix equal parts of bleach and water in a spray bottle.
Mist the stained area of the ceiling tile with the bleach water. Wait 15 to 20 minutes and mist again if the stain has not completely faded.
Soak the end of a cotton swab in bleach for removing darker stains on the ceiling tile, such as the perimeter of the stained area. Dab the bleached-soaked cotton swab over the dark stain, rewetting the cotton swab with bleach often and using a fresh swab when the current one becomes too dirty. Keep scrubbing the stained area with the bleach-soaked cotton swab until no traces of the stain remain.