Tidy recommends scooping solid waste daily. Every week or so, dump out the entire box and wash with warm, soapy water.  When you refill, be sure to use at least 2-3 inches of non-clumping cat litter or 3-4 inches of clumping litter to allow your cat plenty of room to dig and bury. Learn more about the do’s and don’ts of cat litter.