1. Crayon or oil pastel material: Toothpaste+toothbrush (alcohol) Toothpaste is a cleaning artifact, containing a lot of friction agents such as calcium carbonate and calcium hydrogen phosphate, which can remove handwriting by rubbing against the wall. Dip the toothbrush in water, then squeeze a small amount of toothpaste and wipe it slowly. After a long time, you can spray a little alcohol on the crayon and wipe it clean with toothpaste.
Crayon marks belong to wax and will melt when heated. With this function, you can also use a hair dryer to blow hot the windshield against crayon stains for two or three minutes, and the graffiti can be cleaned up.
2. watercolor pen material: watering can+white vinegar+paper towel watercolor pen is alkaline, and white vinegar can be used for acid-base neutralization to remove handwriting. Add a small amount of water to the watering can, then drop a few drops of white vinegar, spray it on the handwriting for a few minutes, and then gently wipe it with a paper towel. Stubborn handwriting can be directly dipped in white vinegar with a paper towel and wiped with a watercolor pen.
3. Ballpoint pen material: alcohol+wet rag The traces of ballpoint pen are difficult to clean. You can spray alcohol on the handwriting, let it stand for 5 minutes, and then wipe it off with a clean wet rag.
4. Pencil material: The method of erasing pencil marks with an eraser should be known to most people, and it is the simplest and most efficient. Just use an eraser.