Prepare two spackling knives in advance: narrow and wide. Make sure they have sharp edges although it isn't always important. It's better to cover the floor with poliethylen before beginning the work. You probably won't find any other material in the same large quantities, and you'll avoid washing the floor. Paper has to be moistened, so power outlets and switches should be closed, covered or else. Next, apply water on walls using a sponge rubber roller or cloth. In a few minutes (you should wait) the paper becomes soggy and can be removed with a simple moves of the knife. The damage done to the walls underneath was minimal. Buckshot remained stuck inside along with pieces of skull. It was decided to leave them, while pieces of flesh were peeled off with the wallpapers. Mix a small amount of spackling powder and level the surface using both wide and narrow knives. Remaining putty was used to cover dark stains left by fluid dripping on the floor. Due to the fact that no one touched them for a long time, they managed to soak into the wall. The sandpaper destroyed the rest of the details.