Hang towels, clothing and anything that can collect moisture. The lower the moisture in the air, the less chance you give mildew to grow. Install bathroom fans or vents to help air circulate. Be sure to vent outside, not into the attic of your home. Once you've cleaned grout, tile and shower stalls, apply a small amount of liquid car wax to the bathroom and polish.
Users insist it keeps things moisture and mildew-proof for up to a year.
Using a squirt of dishwashing gel in a bucket of hot water will help to clean tubs and sink of soap scum and common bacteria. Rinse and dry well. Following each shower, spray shower walls, tiles, curtains and doors. The vinegar will kill the mold bacteria before mildew has a chance to get started, remove soap scum, and body oils. Vinegar is also an effective mildew and odor remover.