I found some answers for your reference,,, 1. Take makeup remover and remove the traces of crayons with cold cream! Apply the cold cream to the graffiti thickly, let it stand for fifteen minutes, and then wipe it with the old cloth you don't want, and the crayon trace will disappear immediately! 2. Use essential balm or safflower oil. 3. Wash the dirty place with oil paint, turpentine or gasoline, and then wash it with washing powder. Gouache and watercolor can be washed off with washing powder or soap in time. 4. If colored pencils scribble on the furniture, remove them with orange peel at this time! And the orange peel essential oil rich in orange peel is quite effective for pencils and ballpoint pens! 5. The oil-based pen uses the perfume removal method! Spray perfume on the paper towel, and then wipe the graffiti with the paper towel. The alcohol content of perfume can easily remove the ink of oily pen. The remaining oil can be cleaned with warm water, and the fragrance of perfume becomes indoor fragrance! 6. Oil pastels are oily materials, containing beeswax, which can only be removed by oily solvents. Such as turpentine, rubber water and other oily solvents, gasoline can also be diluted, and alcohol can also be diluted. These solvents are also highly volatile, so they will not leave stains on the objects to be cleaned. Find a cloth to collect this solvent, and you can clean the pollutants.