My male cats litter box is in a corner, and it smells like the stench is coming off the walls when I clean and move the litter box. How do I get rid of it?

Try vinegar and water, half and half. Vinegar is a natural cleaner, not only gets rid of the smell, but the germs. Try a test spot first, then the whole wall if the test spot is okay.

You might want to consider putting a piece of lino adhered to a board behind the litter box. Your cat is likely spraying the wall, which is why it's smelling. Wit a lino covered board it will be easier to clean. Lino doesn't soak things up like drywall does.

Good luck.