Anyone who has kids knows that kids find markers and pens out of thin air and of course those will be on our walls and floors it all happens so quick then your like wth am I going to do? So I actually found stuff that works on literally anything and everything a child can color with. Lysol, spray it on crayon, marker, pen any kind of mark on the wall or floor then wipe with a dry cloth and gone I have tried this on permanent marker, smelly markers, pen, pencil and it all came off the wall and tile floor. Another trick is hand sanitizer the plain kind. Squirt some on a dry rag and scrub this one takes a little more elbow grease and a few times to do the trick.