For cotton and polyester: Pre-treat stain with liquid laundry detergent. Let sit for 30 minutes. Machine wash according to garment care label. If stain remains, apply a solution of one part vinegar to two parts water with an eye dropper. Mix a solution of ½ cup liquid laundry detergent per one gallon of water in a plastic bucket. Soak garment for 30 minutes. Machine wash again.
For washable silk and wool: Using an eye dropper, apply a solution of one part vinegar to two parts water. Apply a commercial stain remover that is safe for the fabric and let sit 15 minutes. Flush spot with cool water. If stain persists, take the garment to a dry cleaner.