I used to think it was because I was a professional face painter that my children had a habit of drawing on themselves. Let me tell you something about washable markers: They're not. If I didn't wash the ink off immediately, they had that scribbled on look for a week. You may wonder then, why I didn't hide the markers. It's simple. I knew the marker would eventually come off the skin, and crayon was much harder to remove from walls and furniture.