Rubbing alcohol works wonders!
My daughter almost cried when she discovered paint on her denim skirt. We painted her room a few weeks ago so the stain was not recent. I read that alcohol works so I decided to try it. To my amazement it not only worked, but worked well! I poured the alcohol on the paint, then I scrubbed the area using a dish cloth. The paint immediately began loosening. I was able to remove almost all of it by hand, then I put the skirt in the washer to remove the rest of it. This works great!