Oxygen bleach, dish detergent and all-purpose cleaner can be used to remove washable crayons from carpet. The stain may require several treatments and a few hours to completely remove.
Remove any excess crayon with paper towels
Using paper towels or a clean towel, blot the stain beginning at outer edge to remove most of the crayon wax.
Spray the stain with all-purpose cleaner
Dampen the stain with an all-purpose cleaner that has a degreasing agent to break up the crayon wax. Work the cleaner into the carpet from the outside edge toward the center using paper towels or a utility towel.
Apply oxygen bleach or dish detergent
Difficult stains can be cleaned with oxygen bleach. Mix 1 tablespoon of oxygen bleach into a quart of water, then spray the mixture onto the stain. After a few minutes, use paper towels or a clean, dry towel to remove any remaining crayon. A cup of water and 1/4 teaspoon of dish detergent can be used in place of oxygen bleach.
Rinse the rug
Rinse the rug thoroughly with warm water, then place a clean, dry towel over the area to absorb excess moisture. Remove the towel after excess moisture is absorbed, and allow the carpet to dry completely.