Okay, so I know most all of us only have indoor kitties but this questions is about outdoor kitties. I am actually asking this question for my mom-recently all the neighborhood cats have taken up to using my mom's flower gardens as their litterbox. Not so bad way out in the yard but she has a few planter boxes right by the front door that is their litterbox of choice. Does anyone know a good way to deter them from pooping in the boxes-not only is it a non-welcoming sight but also the smell is atrocious! I looked on the web for something and mostly came up with expensive sprays that only work for 24 hrs. We want the problem fixed but we also do not want it to cost alot! Any advice and products are more than appreciated. Thanks!