Okay, so you have your eye on that new hemp shower curtain, but don't toss out that vinyl one just yet. Use what you have. Mildew grows between the folds, so stretch the curtain closed as much as possible. When you're done in the bathroom, open the door to allow moisture to dissipate. And, if possible, run the exhaust fan for five minutes. Old vinyl shower curtains make great craft table coverings.