WD-40 is a lubricating spray that literally stands for water displacement 40th attempt. It was a chemist's 40th attempt to create a spray that would successfully oil machinery. The spray has a multitude of household uses. It can remove grease, wax and crayon stains from your home's walls.
WD-40 on Walls
WD-40 will have no effect on the walls in your home. The spray is meant to create a barrier between grease and the surface material. Thus, the spray is not greasy and will actually remove grease stains from your walls. Use the spray on bare, wooden panel, wallpapered or painted walls.
As a Stain Remover
Use WD-40 on your walls to remove stains, such as crayon and grease fingerprints. To do this, spray the WD-40 directly on the wall and let it sit on the stain for several minutes. Wipe the WD-40 residue up with a clean cloth. Repeat the process if the stain is still there.
Take the proper precautions to avoid damage when using WD-40 to clean spots on your wall. While the spray won't damage your walls, it can be harmful to the carpet or upholstery in your home. Avoid damage by being careful when spraying it. If you are worried about over-spray, spray the WD-40 directly into a cloth and rub it over the stain.
WD-40 lasts a long time and does not have a shelf-life. Store it in a cool and dark place out of the reach of children and pets. WD-40 is a flammable aerosol that can be toxic and cause death if ingested. It can also cause issues if it gets into your eyes and can irritate your lungs if you don't use it in a well-ventilated area.