Bitter sprpy, there are several options at the petstore and I even saw one at Walmart in the petsection, named Odoban, I believe. You can spray it on anything, it will taste really bad, I happen to get some in my mouth by mistake and it is horrible. It will not stain or ruin things…maybe leather or the like but not fabric, wood or anything like that.
I know the look, Otis gives me that on a daily basis...he is 5 months so I am "dreading" the 6-8 months stage ( I heard it gets worse before it gets better). The look makes me think of a cat, that is how cats are...I only come to you when I feel like it..not when you call me...funny and frustrating.
I hope the spray works, it works on Otis, we have sprayed a few chairs, and things like that, he now leaves them alone.