The topic is about oil-based pens, not ink stains such as water-based pens, because we all know that oil is not allowed in water, just like oil stains sprayed on the wall by kitchen cooking. It is difficult to clean with clean water, and it is easy to remove oil stains with cleaning liquid such as detergent.

The first way to get rid of alcohol is very simple, that is, it is easy to buy alcohol by going to many places outside. Pay attention to diluting alcohol, which is sold in hardware and chemical stores and electronic city. Because according to the chemical principle, oil is easy to react with alcohol and is volatile. After cleaning with alcohol, dip the bought clean cloth in the detergent commonly used in washing dishes at home, and finally rinse it with clear water, and the wall will be as bright as new.

The second method, compared with the first method, is not as good as the former one, that is, go to the hardware store outside to buy fine sandpaper, and avoid buying coarse sandpaper. Wipe the oily pen stains on the wall repeatedly with fine sandpaper, so that oily things will be worn off. If you use coarse sandpaper, it will be counterproductive and damage the wall.

In short, there are many ways to remove oily pen stains on the wall, so I won't give examples here, just two of the simplest and most time-saving methods.