If your bathroom is not ventilated properly the build up of moisture may cause there to be mold or mildew. Ventilate your bathroom with a window or if you have one a ventilation system. If you have a leaky shower head in your bathroom this can cause massive water waste and expenditure, this will also add to a build up of moisture in your bathroom and in result mold.
A blocked drain is also a very common issue in peoples bathrooms, this is another one of the factors that contribute to build up of mold. A blocked drain usually happens from hair being lodged inside or debris. These can usually be fixed by flooding the drains with boiling water or a sort of drain cleaner. If this does not work then you may need to do abit of work with a drain snake, this should help fix all of those blockages in your drain.
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