The cats haven't come back
I've been having cats coming on my deck and peeing on my dog's dog house, deck chairs, etc.  Before doing anything drastic I decided to try Cat Mace.  I sprayed the stairs leading to the deck and any point they might jump from to get on the deck.  I'm happy to say that the cats haven't been coming on my deck which is a huge relief.  I truly believe it works and I'm going to buy another bottle for follow-up applications.
Rating: 5 stars