Method 1: alcohol. For waterproof coatings, cleaning wallpaper glue with alcohol will not cause too much damage to the wall, but the evaporation of alcohol can minimize the damage to the wall. However, it should be noted that the concentration of alcohol must not be too high, otherwise it is too volatile and it is easy to turn the white wall into yellow or black, which is a very bad phenomenon. Method 2: salt. This method uses physical friction. But because salt is white crystal, there is no need to worry about the strange color brought by friction to the wall. In the process of rubbing, you can use white gauze or cloth that can be wrapped with salt, wrap a small bag of salt and rub it gently. Slowly, you will find that the glue left by the wallpaper on the wall is slowly disappearing, which in turn sticks to the cloth. You just need to stop, rub and remove the clumps of glue from the gauze, and the next thing goes without saying. Method 3: Scrub the cloth. However, this method is very harmful to the wall paint, because it is possible to grind off the wall itself carelessly, which is believed to be a scene that everyone does not want to see. The above are three methods about how to remove the wallpaper glue on the wall, but if you want to effectively remove the wallpaper glue without affecting the beauty of the wall as much as possible, choose the first method.