Maintaining a dry environment is of the utmost importance to keep your shower curtain from getting moldy. It is only natural for your shower curtain to get wet; after all, its primary function is to stop water from leaking into the rest of your bathroom.
If you have a shower liner, place it inside the tub while keeping the outer curtain on the outside. This will allow air to circulate freely between the two layers. Windows may also be of assistance.
One way to stop your shower curtain from getting moldy is by using vinegar in your washing machine with every load of laundry. Vinegar will kill bacteria and fungus on your curtains, which can help prevent mold growth.
Another way to keep your shower curtain from getting moldy is by using bleach in your washing machine with every load of laundry. Bleach kills bacteria, so it will help prevent the growth of any fungus on the curtains and make them last longer.