Crayon - To remove crayon stains, place the stained surface down on a pad of paper towels, spray with WD-40, and let stand for a few minutes. Turn the fabric over and spray the other side. Apply liquid dishwashing detergent and work it into the stained area. Replace towels as they absorb the stain. Wash in hot water with laundry detergent and bleach for about 12 minutes. And rinse in warm water.
I can only think of one handy hint.....if you wash pants and forget gum in the pocket, you can put the pants in the freezer....when frozen, the gum comes right off. Or put a couple cubes on the gum stuck in the carpet....