You should always close the shower curtain after each use so that it will dry out faster. Also it is recommended to leave the bathroom light and fan on until all moisture is gone. Mold thrive in dark and wet areas!

zep from home depot makes a no rinse floor cleaner. It's in a solid blue container. anyway. when you have cleaned your bathroom tub and have removed as much mold and mildew as possible, spray a mist of the cleaner diluted to help prevent mildew growth. You can spray some in the toilet bowl to help reduce that pink ring you often get when the water sits too long. About and ounce of floor cleaner in a 32 oz bottle is perfect. You may also use this as an all purpose cleaner for the bathroom cleaning counters, toilets, mirrors, sinks, etc. Not for use on surfaces where you may prepare food.