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Extra ventilation while showering
While showering, set the (mechanical) ventilation to the highest setting. At least an hour after showering. And keep the bathroom door closed. When you're done showering, open a window and leave the door closed. Wipe the walls and floor dry with a squeegee.
No mechanical ventilation? Then open a window while showering and 10 minutes after showering, so that the humid air does not linger in the house.