I read the initial post and thought "plexi glass"....and now I know that might be a real solution for you! My Mimi will scratch the wallpaper right off the walls, never covering her poop, so something to protect the wallpaper is imperative!! Thank goodness, both litter boxes are either on hardwood floors or tile, both of which are easy to sweep up. Both kitties make a mess, even if they are indoor/outdoor kitties. Mimi is my biggest culprit...she spend WAY more time inside than our Wonder Buddy does.