To remove removable wallpaper from plaster walls, start by peeling off a corner of the wallpaper and pulling it away from the wall slowly and carefully. If the wallpaper doesn't come off easily, use a wallpaper scoring tool to create small punctures in the wallpaper to allow the wallpaper removal solution to penetrate. Then, apply a wallpaper removal solution to the wallpaper and let it sit for several minutes before peeling off the wallpaper. Finally, wash the wall with a sponge and warm soapy water to remove any remaining adhesive residue.

Read more about removable wallpaper: How to correctly choose, install, take care of and remove Peel and Stick wallpaper