It's important to act quickly once you've discovered crayon marks on your suede couch. The longer the stain sits, the more difficult it will be to remove.
Suede cleaner and some ice may be all you need to remove the stain, and you should always keep some suede cleaner on hand if you have suede furniture. If you don't have any suede cleaner handy, white vinegar can serve as substitute in a pinch.
Place an ice cube in a freezer bag and set the bag on the crayon stain for a few minutes. This will freeze and harden the wax residue so you can scrape it off with the dull side of a butter knife. Scrape gently and keep the knife perpendicular to the couch; don't hold it an an angle or press hard enough to dig into the fibers of the couch. The goal is to remove as much wax as possible from the surface of the suede.
Lightly dampen a white cloth in undiluted white vinegar. Always use a clean white cloth or sponge: a colored cloth may transfer its dye onto the couch rather than absorbing the color of the crayon.
Use the cloth to blot the solvent onto the stain, starting at the edges and slowly working your way toward the center of the stain. Don't saturate the cloth, as the goal is to keep the couch as dry as possible. The stain should transfer off the suede onto the cloth.
Press a clean, dry white cloth into the couch when you are finish to absorb any remaining vinegar.
If any stain remains, dip a clean white cloth into some suede cleaner and blot the stain with it. Once again, work from the edge of the stain toward the center. Soak up any additional cleanser left on the suede with a dry white cloth.
Brush the couch with suede brush when you are done cleaning to restore the nap of the suede fibers. If you don't have a suede brush, use a clean, white bristle brush in a circular, swirling motion.
Pour some rubbing alcohol into a spray bottle and mist the stain completely.
Rub the stain with a new white sponge. As you do, the crayon will transfer onto the sponge. Swap your sponge for a new one after it collects some of the crayon to avoid spreading the stain.
Allow the couch to dry completely and then brush it with the suede brush.