To clean the reusable liner, use mild dish soap and warm water. For a more thorough cleaning, soak the liner in diluted dish soap and water for 15 minutes to allow the soap to penetrate the seams.
Let it dry for at least 24 hours. For stubborn odors, use an enzyme cleaner and follow the instructions on the bottle.
Maintain the recommended 3-4 inch litter level by adding new litter. This will enable your cats to bury their waste properly and prevent urine from reaching the liner at the bottom of the litter box.
DO NOT put the liner in the dishwasher, dryer, or washing machine.