Of course it must have been a visiting child that left those boogers on my walls, because none of my 3 kids would ever do that...Ha! Anyways, getting a dried booger off the wall is really hard. It's stuck on enough, that if you chip it off (with a finger nail or knife, yuck) it will take the paint with it. This technique will work with lots of stuck on goobers. You are welcome. It couldn't be simpler.