Crayon marks have a way of ending up in places you may not expect, such as all over the couch. Crayon wax may work its way down between woven fibers, requiring more than one method before its complete removal from an upholstered couch. Scraping hardened crayon wax off fabric, leather or faux leather removes a good deal of the substance without requiring harsh chemicals.
Place a handful of ice cubes in a zippered sandwich bag and seal the bag. Set the bag over the crayon mark for 10 minutes or so to make the crayon wax harder. Set the bag aside after the time has passed.
Pick at the crayon mark with your fingernail, the edge of a plastic knife or the bowl of a plastic spoon to loosen some of the wax.
Vacuum the loosened crayon wax particles to prevent them from becoming trapped between couch fibers or working its way beneath a cushion.
Heat an iron to a medium setting without steam if some of the crayon mark remains on a fabric-based couch. Place a plain brown bag or sheet of brown craft paper over the crayon mark. Iron the paper for 10 or 15 seconds without the iron touching the couch fabric. Lift the paper -- if heated enough, the crayon wax should have transferred onto the paper. If the paper has no wax on it, set it back over the crayon mark and iron it a little longer. If the couch is leather or faux leather, heat the crayon mark with a hair dryer, then blot the wet wax up with an absorbent white cloth.