Paige, does alcohol get it off the walls without taking paint too.  My boys are into dyeing their hair, and I told them no more since we painted the bathroom. Cause the stuff they use is the temporary stuff.  I don't know that they make crimson red or orange or green,in permanent.  So with each shower they would have to try to be careful not to flick their hair and splat the wall. Sigh, oh how I hate that stuff.