Stain removal is all about speed and technique. Here's the proven method for tackling paint effectively.
Check the paint can or label. Latex (water-based) and oil-based paints require different removal methods.
While wet, rinse under warm water. If dry, scrape off excess with a butter knife, then apply rubbing alcohol and scrub.
Apply paint thinner or turpentine to a cloth and blot the stain. Work from the outside in. Rinse with warm soapy water.
Wash with Power Wash Laundry Detergent. Check the stain before drying -- repeat if needed.