The main cause of mold on a bathroom ceiling is a broken or ineffective exhaust fan.
Mold in bathroom ceiling and walls.
And of course there are abundant water sources for mold created by the running water and steam.
Bathroom mold occurs primarily because mold loves damp dark isolated spaces says larry vetter of vetter environmental services in smithtown n y.
Mold can often be found in the shower and the bathtub.
Pour into a spray bottle.
Combine two tablespoons of borax with 1 4 cup white vinegar and two cups of hot water in a bowl.
Here is a link.
Liberally apply on painted walls.
The lack of light in the bathroom would not directly cause the mold growth.
Cleansers with bleach or even white vinegar can often keep the slimy hairy growths from taking root in the bathroom.
I recommend replacing the fan with a constant flow unit such as the panasonic whispergreen fan.
Nothing beats this practical solution to mold in the bathroom ceiling.
Scrub thoroughly and wipe clean then spray again and let sit for 10 minutes before wiping.
Typically a bathtub shower or entire bathroom remains damp enough for mold growth just from showering or bathing common causes of bathroom mold.
Grime from body oils and soap scum which is washed off and onto the shower or tub create a food source for mold to feed on.
If you apply the mold resistant paint to the ceiling you already have a fool proof solution to mold problems in that region of your bathroom.
Mold and mildew resistant paints are naturally designed to prevent mold and mildew from growing in the house.
Wearing gloves and a mask can protect people from inhaling any mold spores as.