How do I remove and prevent mould on my bathroom ceiling?

I suggest get professional to check it… if there’s a mould that you can see it means the moisture inside that wall is spreading and it cost a mould… maybe they forgot to waterproof the ceiling … and check your exhaust fan if it working properly to take away the moisture during showers…thank you

Cleaning with just a dry cloth or even bleach usually only treats the surface. Mould comes back if there’s still moisture or poor ventilation. First, make sure your exhaust fan is properly sized for the bathroom and running long enough during and after showers. Check that it vents to the outside, not just into the attic. To remove existing mould, use a solution designed for mould removal or a mix of water and vinegar. Scrub gently, let it dry completely, and then repaint with a mould-resistant or bathroom-specific paint. Preventing it long-term means controlling moisture, running the fan, fixing any leaks, and keeping surfaces dry. Adding a dehumidifier can help in bathrooms with persistent humidity.

The new building code says there needs to be 1 continuously running bath fan in the house. The new bath fans depending on brand (panasonic, wink wink) are very quiet as in cant hear it.

Does the bathroom ceiling exhaust fan connect with an exterior vent drawing the moisture out of the home or is it simply expelling to the attic.

Mould on a new bathroom ceiling means ventilation + paint system failed, not that you cleaned it wrong. Fix airflow first, then repaint properly — otherwise it will keep coming back no matter what you clean it with.

If the mold penitrated into the gypsum the drywall will start crumbling. If its a small bathroom, then remove the drywall on the ceiling, this would be a good time to move the ceiling fan to a better location and install mold-resistant drywall. Make sure you us the proper primer for bathrooms, then you can paint with latex

Is this bathroom ceiling below the attic? If yes, then there is a cold spot. Missing insulation in the attic. Check in the attic that the vapour barrier and the insulation has not been disturbed above the bathroom. The warm , moist air is condensing against a cold ceiling.

If mould is coming back that fast, it’s not a cleaning issue. Most of the time it means the bathroom fan isn’t venting outside properly. If moist air is going into the attic or the duct isn’t connected well, the moisture just stays there and mould keeps returning. Sometimes the fan is also just too weak to clear the moisture properly. Check where the fan actually vents. Once airflow is fixed, cleaning and repainting will last.