Purrley, Maybe your kitties are a little too vigorous in their digging in the box and are hurling the contents against the wall. My Andy covers his treasures furiously and occasionally one might wind up on the floor by the box. I think rather than scrubbing the wall, you might put some saran wrap on the wall where the poopies wind up going. Maybe you could secure it at the top with some masking tape or something to protect the wall. Then you would just have to put up a new piece of saran instead of cleaning the wall. Just a thought....