Always read and follow the care instructions and any warnings on the garment label. And, follow the General Rules for washable fabric stain removal.
The best way to deal with crayons is to get advice right from the horse's mouth....Crayola! See their removal tips at their web site.
For another option, here's what another source says: Scrape excess crayon with the dull edge of a butter knife.
Wash in hot, soft water with soap, such as Ivory and 1/2 cup baking soda for 10 minutes.
If the stain remains, work soap paste into the stain. Wash 5 minutes. Rinse.
To remove any remaining color use bleach or color remover as safe for the fabric. Always test for color fastness.
ZyYIA - Item 790 - Black Pocket Light N Tight
Our most popular leggings, this high-performance design offers a firm compression that feels oh-so-supportive whether you plan to run a marathon or just run the day. The fitted design and high quality fabric contours to your shape stay in place for a frictionless, effortlessly flattering look.
ZYIA - Item 3535 - Men's Army Green Crew Sweatshirt
If you like to layer on warmth without adding fleece, this Terry sweatshirt delivers that classic cotton feel and weight you love, without the fuzz. Effortless to wear and to care for, this relaxed crew top makes good on the classic sweatshirt promise of comfort, flexibility, and durability.