I have a major problem w/ cats outside. We have 3 rescues which stay outside and are all neutered and spayed. One of them is feral(female) and all have been living here for the past 3-4 years. We have a large garage. I've mounted a pet door for them so they have access to it. For the last 2 wks. one of them, don't know which one, has been doing their business in the corner of the garage and will not stop! It is clean and free of dirt or debris so it can't cover it up. Also one of them, the male I assume, will jump up on my toolbox in my truck bed and spray the back window of my truck. We live in the country. You can't see any of our neighbors. We have close to 4 acres w/ a third being wooded. The remaining is all grass. Why w/ all of that space do they now want to crap in the garage where they sleep and eat?! Ughhhh! Is there any type of spray or chemical I can put down in order to deter this? Any suggestions would be appreciated.