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Experts answer: The yellowing of the wallpaper is generally divided into the following situations: If the wall ash is not dried yet, that is, when wallpaper is attached, the alkaline material in the wall ash easily reacts with the bottom of the wallpaper to cause yellow packets on the surface. This phenomenon is more difficult to deal with. It is necessary to remove the wall and re-construct it. If yellowing occurs after living for several years, most of the reasons are due to the aging of paper due to exposure to sunlight and air. At this time, you can use “safety bleach†to wipe on the towel and wait until half an hour before using clean water. Wipe again, (you can do a small test on the concealed part of the wall first) to observe the effect, if the effect is ideal, you can use it as a whole wall treatment. If it is partially smoked and yellowed, it should be diluted with caustic soda.