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The easiest way to keep mildew off your favorite plastic shower curtain is to prevent the icky growth from happening in the first place! Here’s what to do: Before you hang up a brand-new curtain, fill the bathtub with a few inches of warm water, then add two cups of table salt. Submerge the new curtain in the saltwater bath, and let it soak for about 10 minutes. Shake off the water, dry with a clean cloth, and then hang your mildew-proof curtain.