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Mold spores are everywhere in the air. They just need to find a suitable place to live in order to settle down and start growing into actual mold. There is nothing you can do about the presence of mold spores, but you can stop them from finding a place to settle own.
For mold, suitable living quarters primarily need to be nice and moist. Most of the walls, floors and ceilings in your house are (hopefully, if all is well) too dry to support mold. But bathrooms can get pretty moist, obviously. That doesn’t mean every bathroom will develop mold, though. As long as you have proper ventilation, heating and insulation (since cold surfaces receive more condensation), your bathroom walls and ceiling should not stay moist all the time. They should dry out sufficiently from time to time, in order to kill any mold that’s trying to get a foothold.
You can help your bathroom surfaces to dry out by wiping them down after use (e.g. by squeegeeing your shower walls and floor). However, you want to get the basics right first, and that means (as I mentioned), ensuring proper ventilation so humid air can escape, and not letting your walls & ceiling get too cold as this causes condensation to form on them. You can also paint ceilings or walls with special mold-resistant paints.
Why does mold form mainly on the ceiling and between tiles? The surfaces of bathroom tiles don’t provide a good living area for mold. They are slippery and non-porous, and don’t hold onto water. The grout between the tiles is a more friendly place for them. Ceilings usually aren’t tiled, and can receive a lot of moisture due to hot, humid air rising up and then condensing on the ceiling. Also, mold does need to eat, and things it can feed on include wood and dry wall.
“The mold of that’s it be from”? Stroke you had or Yoda you are?
Its mostly old organic matter, oils, skin cells, etc, that has attached itself to the grout (the stuff between tiles). It will have been colonized by bacteria but doesnt mean that they are ‘bad’ bacteria. The best way to clean it spotless is with a pressure washer. Scrubbing can work but grout is rough like sandpaper, your brush will not get the ‘dark’ stuff our because it is mashed in there.
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