I have a cat question. I have split foyer house. The windows on the bottom are level with the house. My kittys like to sit and look outside. In the middle of the night we get other cats who are allowed outside coming up to the windows. I fear for my screens and if the windows are closed I get males who mark on the window. I put up a fence but as we all know cats are good at getting where they want to go. Is there anything that would repell them and still allow my kittys to look out? I have tried just a spray bottle but my husband thinks I will be carted off for running out in the middle of the night and chasing cats.