First and foremost, you need to make a paste out of the baking soda. You can use warm water to make that paste. Then it would help if you took a damp cloth. And apply that to the wall. Try to scrub in a circular motion with the help of a damp cloth. This is how you can easily remove the crayon by using baking soda. However, if you want to know how to remove crayon from wall, read the above article carefully.