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How to clean your kitty litter box 
Scoop it once a day. 
Your kitty likes a clean litter box, and while you probably don't want to change the litter completely every day, scooping it daily will help keep your cat happy. You should definitely scoop out out any feces, as well as any pee clumps if you're using a clumping litter.
To scoop it, use a litter shovel to remove the clumps. These scoops are slotted, the clean litter falls below, while the scoop keeps any clumps.