Myth file № 19 · Crayon
Does WD-40 remove stains?
It loosens crayon, gum, adhesive and old grease, but it is an oil, so it leaves an oil stain of its own.
01 The verdict
WD-40 is a petroleum solvent and lubricant. Like dissolves like, so it softens waxy and sticky residues such as crayon, gum, label glue and dried chain grease.
On fabric, carpet, stone and suede it leaves its own oily patch, which then needs dish soap or a dry cleaner. On walls or plastic, use it only if the exact surface and product instructions permit it; some paints and plastics are damaged by solvents.
Use it on a cloth, never sprayed straight on, and follow up with warm water and dish soap.
02 What actually works
Crayon on wall
- Lift what you can. Gently lift any solids or excess with a plastic card held almost flat to the wall.
- Warm and wipe. Warm the remaining wax with a hair dryer on low, held about 15 cm (6 in) away and kept moving, then wipe it off with a paper towel as it softens.
- Wash gently. Wash with a soft sponge and a few drops of dish soap in warm water, using light circles. Rinse with a clean damp sponge and pat dry.
- Gentle paste. For a shadow on paint, rub very gently with a paste of baking soda and water on a soft cloth, then wipe clean. On flat or matte paint, test first: abrasion leaves a shiny patch.
- Rinse and blot. Wipe with a clean damp sponge and pat dry with a soft cloth. If a faint mark remains, touch up with matching paint rather than scrubbing.
Never: Scrubbing matte paint.
Crayon on clothes
- Freeze it hard. Bag of ice for 10 min, then chip it off.
- Scrape off the excess. Lift the excess with a spoon edge; don't press.
- Iron it into paper. Paper over it, warm iron, no steam.
- Work in dish soap. Dish soap worked in, warm rinse.
- Oxygen bleach soak. Oxygen bleach only if labels permit; follow product directions.
- Wash and check.
Never: The dryer, Rubbing.
Crayon on plastic containers
- Freeze it hard. Bag of ice for 10 min, then chip it off.
- Scrape off the excess. Lift the excess with a spoon edge; don't press.
- Degrease with dish soap. Warm water and dish soap.
- Oxygen bleach soak. Oxygen bleach only if labels permit; follow product directions.
- Wash and air.
Never: Microwaving it.
03 The products in question
WD-40
A petroleum-based lubricant and water-displacing spray. Spray a little onto a cloth, not the surface, to loosen crayon, gum or adhesive, then remove its own oil with dish soap.
Solvents dissolve what water cannot: inks, resins, waxes, adhesives, nail polish and some oils. Each solvent dissolves particular materials, which is also why each one can damage particular surfaces.
04 About crayon
Crayon contains wax, which is solid at room temperature. Cold makes it brittle enough to snap off; gentle heat melts it so it can be drawn into paper.
Crayon can contain pigment particles that do not dissolve readily in water. Many must be lifted with an appropriate cleaner rather than relying on bleach. Avoid grinding particles into the material; pigment chemistry and product formulas vary.
- Crayons are paraffin wax and pigment. One crayon left in a pocket can melt across a whole dryer load and coat the drum.
- Paraffin melts at roughly 50–60 °C, so an iron on low over paper towels lifts it up out of fabric.
The full crayon dossier covers every surface on file.
05 What never to do with crayon
- Scrubbing flat or matte paint. Friction polishes the paint and leaves a shiny patch that shows more than the mark.
06 Questions
So what should you use on crayon instead?
On wall: lift what you can, warm and wipe, wash gently and gentle paste. The order matters as much as the products.
Is the myth harmful?
It can be, depending on the product and material. A general myth verdict does not establish safety or a measured success rate. Follow the item and product labels, pretest a permitted treatment and stop for any change. It is an oil: it leaves an oily stain of its own on fabric and porous surfaces.
Does it work on wall, clothes or plastic containers?
On wall, the file rates crayon manageable (2 of 5); On clothes, the file rates crayon manageable (2 of 5); On plastic containers, the file rates crayon easy (1 of 5). It loosens crayon, gum, adhesive and old grease, but it is an oil, so it leaves an oil stain of its own.