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.
DRAPER BODY THERAPY® BLUE T-SHIRTS
This shirt is made of a comfortable and breathable material that is designed to be both stylish and therapeutic. The T-Shirts are versatile enough to wear casually, use during athletic activities, to sleep in, or as a base layer on chilly days. The Draper Body Therapy Blue T-Shirts contain 50% Celliant® (Polyester) and 50% Tencel. Celliant® is the world's most technologically advanced fiber which contains a proprietary blend of minerals which have been extruded into a polyester fiber. Learn more about this technology. Shop for this technology>
KIDS SOLID COLOR SUNHAT
Made using a patented, chemical-free cooling fabric deigned by Coolcore, the Dr. Cool Kid's Sun Hat is the perfect sun protection. The wide brim provides shade while a moisture-wicking sweatband helps keep you cool. Colors: Blue, Fushia, Lime Punch. Learn more about this technology. Shop for this technology.