DriPro did ok for me a few weeks back.
Apply to cloth, dab onto mark, leave about a minute, and then with a clean cloth gentle massage it off. Try not to rub around spreading it.
Repeat.
Alternatively, apply dripro, then extract with hand tool.
Repeat.
Be aware that if the material is WHITE then it is unlikely you will remove 100% all signs of the crayon stain.