How do you get rid of cat feces smell?

If the smell is in a litter box, thoroughly empty and clean the cat box. Use soap, water, and then let it soak in a bleach solution for a time. Rinse. Use a good quality multi-cat clumping litter. If the house smells, use a white vinegar solution to wash the walls and floors. If the cats have been using a place on carpet, the smell may remain until you replace the carpet. Once the house smells good again, clear the cat box daily, putting the debris into an outside trash can.