Make sure you are in a well-ventilated area. Open windows. Place rubber gloves on your hands to protect yourself from any skin irritation that may be caused by the turpentine.
Lie the polyester fabric over a large bowl so that the stain is in the center.
Empty half a cup of turpentine into a cup with a spout.
Pour the turpentine over the stained area, allowing the excess liquid to fall into the bowl.
Rinse the polyester fabric with water.
Repeat Steps 3 to 5 until the paint is completely removed from the fabric.
Apply laundry detergent to the area that was stained. Gently rub the detergent into the fabric with your fingers.
Rinse polyester fabric with water. Wash it alone on the "heat" cycle.