To get out moldy spots, throw your plastic or vinyl curtain in the washing machine with a little detergent and bleach (if the curtain is white or clear) and add two or three old white towels for extra cleaning agitation.

Then either hang the curtain to dry or put it in the dryer on low heat for three to four minutes or the lowest setting. To keep it fresher longer, stretch the curtain out after each shower to help moisture dissipate.