Polyester is a long-lasting synthetic fabric that's generally easy to care for. One area of caution for polyester fabrics is heat from a clothes dryer or iron, as either can cause the synthetic fabric to melt. Keep this in mind when removing mildew from your polyester fabric, but don't let it stop you from getting rid of the fungus. Using supplies and techniques safe for polyester ensures that you get rid of mildew stains without damaging your clothing.
Mix 1/2 cup all-fabric bleach and 1 gallon cool water in a bucket. Place your mildew-stained polyester garment in the bucket of diluted bleach solution. Soak the fabric for 30 minutes to kill the mildew spores and help remove stains.
Wash your polyester clothes in a washing machine, using warm water. Add laundry detergent and 1 cup white vinegar to the wash cycle. Vinegar kills remaining mildew while also removing the stains and mildew odor.
Hang your clothes to dry on a drying rack. If possible, place the drying rack outdoors so the sun can dry your clothing. Sunlight is a natural mildew killer and odor remover.