Dilute 3 to 4 tablespoons of soda crystal powder in a bucket of cold water - then apply this mixture on your wallpaper using a stitching - soak the wall of this solution and let it take 15 minutes - the paper Painted must take off from himself! If this is not the case, it is sufficient to renew the operation - some painted papers have a finish that decreases their absorbent power, they can therefore combat the action of the soda crystals - do not forget to wear gloves to manipulate the crystals of soda because they are irritating to the skin.