For cotton and polyester: Gently apply laundry detergent and warm water to stained area with a sponge. When paint has softened, scrape off with a dull knife. Rinse and repeat as necessary, then machine wash according to garment label.
For washable silk and wool: Same as for washables, but do not machine wash—air dry. If stain persists, take garment to a dry cleaner.