So your toddler got a little carried away with her crayons and used your walls as a canvas for her doodles. Instead of fretting over the mess, or scrubbing the walls to no end, try this simple hack.
Turn the hair dryer on high and point it towards the doodled-on wall. The crayon, which is made of wax, will melt effortlessly, and you can just wipe it away after a few minutes with a piece of damp cloth. Try it and let us know if it works for you!