Ok, I've tried sticky tape. He walks on it like it's not there. Tin foil, he walks on it like it's not there. INfact tried to eat it. Shook a can w/ coins. Looked at me like I was stupid. The only thing that works is spraying with water. But that's when we're awake. I don't know how many times we squirt him a day. He just does not give up. I may have to move a litter box into our bedroom and lock him up in there with us.