Crayon Marks on Walls
1. A damp rag, dipped in baking soda works great! Comes off with little effort (elbow grease that is!).

2. "I also saw on a tv show that you can use WD-40 to remove crayon marks and then wash the item with dish soap to remove the film."

becareful with the wd/40 it will stain some walls

I had to remove crayon marks from the walls of my new house before we moved in and it's not hard if you live in a house that's made of metal.