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How to prevent mildew on a shower curtain
Use a shower curtain or liner with a smooth, consistent surface.
Shower curtains with raised or etched patterns may allow moisture or water to collect in certain areas; whereas a smooth curtain will allow water to glide down into the drain.
Ventilate your bathroom during and after your shower.
This procedure will help your bathroom dry at a faster rate and help eliminate moisture buildup. Open the window in your bathroom or turn on the ventilator fan to help remove excess moisture.