I put the entire box inside a large garbage bag and turn it upside down. I beat on the bottom of it until everything falls out. Then I take the box out of the garbage bag and take the bag outside. Then, I pour about a capful of bleach into the box and run hot water from the shower into it. I swirl the water around some, then empty the water into the toilet and flush. I take some paper towels and dry it thoroughly. Then, in goes a couple of cups of Feline Pine topped by cheapo clay litter. 10 seconds after I set it down, Willow comes over and poops in it!