H.L.
We had this happen last spring, causing me to do some extensive web research. What worked for me was a combo method: First, I used Zout stain spray (Walmart) .Spray the crayoned spots and leave it on til it dries- this is the whole key!) After the Zout dried, I rewashed the whole load on hot with 2 cups of the detergent, and a cup of liquid oxyclean (Walmart or Target). Let the washer fill up with hot water, leave the lid up and let it soak for 30-45 min before you let it run thru the cycle. I only had to do this once, and it got all of the crayon out. We had washable silk, wool blend slacks, cotton, synthetics, and denim in the wash- all came clean and none were ruined!!!
Hope this helps!