"Washable crayons" are crayons that can be cleaned easily with water and soap because they are designed to not permanently stain surfaces like regular crayons do. Full definition
If you typically let your child play on a tablet while you shower or prepare dinner, find an activity she can do alongside you instead (color with washable crayons on the outside of the tub, say, or tear up lettuce for a salad). (verywellfamily.com)
Crayola Washable crayons are a must - have for families with young children learning to color. (thespruce.com)
You might still end up with doodles on a wall or in books, so choose washable crayons or markers. (babycenter.com)