In one of our bathrooms, there is very bad ventilation. The fan is really not that strong and when the house was built, they put in windows that do not open. As a result, we get a lot of water stains on the ceiling also mildew. It is very hard to clean. Does anyone have any tips on how we to clean the ceiling and maybe some tips going forward with this. I have tried sprayig it with bleach and scrubbing with a brush, but it is not very effective. It has started to stain part of the ceiling orange.