Exposing shower curtains to damp conditions may result in unsightly mildew, mold and soap scum. Some materials aren't suitable for cleaning in the washing machine, such as plastic or vinyl. Depending on the type of stain your shower curtain has, wash it in the bath tub with a different cleaning solution. Use bleach for mold and mildew stains, and white vinegar for soap scum.
Remove the shower curtain from the rings holding it to the rod. Most types of rings can be snapped open from the bottom. If you would like to clean the rings too, remove them along with the shower curtain.
Fill the bath tub with very warm water, and add two tbsp. of laundry detergent. Add either one cup of vinegar or bleach to the water and allow the flowing water to mix it up. Turn off the water when the tub is about one-half to three-fourths full.
Add the shower curtain and rings to the tub. Allow them to soak for 20 minutes. Use a sponge to wipe any areas that haven't come clean after soaking.
Drain the water from the tub. Refill it with cold water, and swirl the curtain around to rinse away any soap or bleach. If you use bleach, it may require a second rinse. Drain the tub again.
Remove the rings from the bath tub and set them aside to dry. Press or squeeze the shower curtain to remove excess water. Replace the rings and hang up the shower curtain to dry. Make sure the bathroom is well-ventilated to aid in the drying process.