Remove Crayon Markings From Walls

This ones especially useful for those of you with young children.

Take a piece of bread, roll it up into a tight ball and rub back and forth over the crayon markings.
This may take some time and you may have to re-roll up the bread a couple of times depending on how big the markings are.

Other cleaners and such may work as well, but the chemicals may damage the paint on your walls…