For various reasons, using a dishwasher to clean your litter box isn’t a good option. Obviously, it’s unsanitary to put cat poop in the dishwasher, but most litters are also bad for plumbing.
It’s Not Sanitary To Clean Litter Boxes In The Dishwasher
Even if you can’t see it, there’s fecal matter on almost everything, so there’s certainly some cat poop on your cat’s litter box- even if you can’t see it with the naked eye.
Not only could there be cat poop left on the litter box, but some of that feces may end up on other parts of the dishwasher just waiting for the next load.
The porous nature of a dishwasher may not be an issue when used now and again, but over time, especially if the litter box or scooper is quite dirty, it can build up, leading to bacteria growth or smell.