Here is a commercial litter box. See this clever box and all of its clever groovy grooves? See debris embedded in groove from clump just knocked off of the side?
A little history here. I’m scooping said box in my usual efficient manner with a large kitchen can full of leavings from previous boxes sitting conveniently near-by, when I discover A CLUMP ON THE FAR SIDE! I smoothly pull the box out from the wall, spin it neatly around to get at the offending smudge, knocking over the kitchen can in the process. What a mess! I never cuss or use foul language!? Like hell I don’t! My clumsiness is bad enough without litter boxes built with groovy grooves. Do these manufacturers ever actually, DUH, clean a litter box?? I’m predicting this box has a short expiration date in this house and may even elicit a personal review from me to the manufacturer.