How do I prevent mold growth on the ceiling?

So I actually ventilate several times a day even in winter and mold keeps coming back. It is wise to leave the window open all the time to prevent mold or what helps. Our room air quality is poor if we do not ventilate. May be due to the old ps4 or on my pc but i don't think it's the pc.

As you should probably know, a person normally takes a shower with water in order not to be dirty anymore. So occasionally wet the ceiling so that she can take a shower and it no longer shimmers.

Am btw. Not an expert on the subject.

"… May be due to the old ps4 …"

: -

Something like that mostly hangs on old carpets, wallpaper and Co.

You ventilate properly by opening the window FULLY 3 times a day for 10 minutes (NOT tilted) and then repeatedly heating it to room temperature.

If the room "smells", then it is very helpful if you put an ozone generator in there for 15 minutes. After that nothing smells anymore.