–Nestor – Cat Litter Box – Dark Green/White – 56x39x39 cm The Beeztees Nestor cat litter box is very well designed. You don't need to remove the entire top lid to clean this cat litter box. It's very quick and easy to unlock the door and the inner part of the tray when you want to clean it. Once detached, you can push this part upwards for easy access.