Even if you have a regular domestic cleaner there are some tips you can use to prevent mildew build up in your bathroom. The best way is to keep a window open while taking a shower or have the exhaust fan on. Good ventilation after showering will keep away condensation and mildew formation.
If you haven’t done your domestic cleaning by yourself for a while but you would like to tackle your bath tub this time, start with rinsing it and removing hair from drain regularly after use, finishing off with a dry cloth. Weekly ask your domestic cleaners to clean the tub thoroughly. It is a good idea to be done straight after showering as the steam will facilitate the cleaning process.
If you have a fiberglass tub use a soft cloth or a sponge with an all-purpose cleaner. Make sure that you or your domestic cleaner do not use abrasive cleaners or scrapers in order to avoid scratches. Porcelain tubs are more resisting to scratching but it is still recommendable to avoid harsh abrasives or strong chemicals.