Things You'll Need
Melamine foam sponge
Mild dish soap
Bucket of warm water
If the crayon marks got into a crack or crevice on the plastic, making the crayon difficult to reach, apply a little baking soda to a damp toothbrush, then scrub the affected area with the toothbrush. Use the toothbrush only for household-cleaning purposes.
Place a plastic bag of ice over the crayon until the wax hardens. Pick the wax away with your fingers or with the bowl of a plastic spoon.
Always wash plastic surfaces after removing crayon to ensure they are clean if toddlers or young children may be tempted to put their mouths on the plastic.
Scribbles meant for paper or a coloring book may end up elsewhere, such as all over a plastic table or chair in your child's room. While that waxy residue may not wipe away with soap and water, other household materials remove crayon from plastic without damaging the surface.
Pour a small amount of baking soda onto a damp cloth. Rub the area of the cloth containing baking soda over the crayon marks. Wipe down the plastic with another damp cloth.
Rub the crayon marks with a melamine foam sponge.
Spray or squirt a citrus-based cleaner over the affected areas if other methods have not completely removed the crayon. Allow the cleaner to work on the marks for at least five minutes, then wipe away the cleaner with a damp cloth.
Add a squirt or two of a mild dish soap to a bucket of warm water. Dip a soft cloth into the water, then wash the plastic surface or object completely. Wipe it down again with a fresh damp cloth.
Kathy Adams is an award-winning writer. She is an avid DIYer that is equally at home repurposing random objects into new, useful creations as she is at supporting community gardening efforts and writing about healthy alternatives to household chemicals. She's written numerous DIY articles for paint and decor companies, as well as for Black + Decker, Hunker, SFGate, Landlordology and others.