First treat the crayon stain with WD40 let sit for a few minutes then treat again.
Then treat with liquid dishwashing detergent and work it in gently.
wash in as hot a water as you feel safe with
use a laundry detergent and color safe bleach
wash at least 12 min on high
rinse with warm water.
This suggestion is meant more for washable fabric obviously but if you are careful I think that you can make it work for you. the WD40 is the trick to break it down and the dish detergent is a grease fighter. I wish you well.
I had to do this process to an entire load of laundry worth over $200. It worked.