Read this tip to make your life smarter, better, faster and wiser. LifeTips is the place to go when you need to know about Wall Cleaning and other Cleaning topics.
You probably won't be able to remove the stain without harming the paint underneath. Turpentine would likely remove the stain, but test it in a hidden area first. You may need to repaint the spot, if you do not have any matching paint, you can take a small chip into a paint store and they should be able to make an exact match.