Plastic shower curtains don't show up in many interior decorating magazines, but they're a practical choice for many people because they provide protection from water damage and easily wipe clean. If your plastic shower curtain gets wrinkled, there's also an easy way to get the wrinkles out.
Fill your washing machine about a quarter of the way full with old towels.
Start the washing machine on the delicate cycle and wait for the machine to fill with warm water.
Add the shower curtain to the filled washing machine.
Lower the lid, and let the washing machine run until it finishes the rinse cycle.
Lift the lid and remove the shower curtain. Close the lid to allow the towels to finish washing.
Hang the wet shower curtain up right away. As it dries, all the wrinkles will fall out of it.
If your new shower curtain has creases when you first unfold it to hang it up, try taking a shower. Often, that's all it needs to erase those creases.
If you want to clean your shower curtain at the same time, add 1/2 cup of baking soda with 1/2 cup of laundry detergent when you put the shower curtain into the washing machine. Pour a cup of vinegar in during the rinse cycle, and your shower curtain will be clean and wrinkle-free.