I find melamine foam, like Mr Clean magic erasers, makes removing assorted drawing implements from walls a lot easier. It'll even remove pen and pencil. I add a

I find melamine foam, like Mr Clean magic erasers, makes removing assorted drawing implements from walls a lot easier. It'll even remove pen and pencil. I add a little soap and just scrub away, rinsing frequently. You have to be careful because it's an abrasive and some wall surfaces might not like it. It seems fine on the paints I've cleaned, though.