This may be the biggest source of cat smell in your home, so turn your attention here first.
Scoop the litter boxes daily, if not more often. And, of course, get the waste out of your house! You might consider using a product like the Litter Genie, which stores scooped cat waste in plastic bags inside an airtight container until you’re ready to go to the garbage.
Use unscented litter. Like air fresheners, scented litters only “mask” smells. Plus, lots of cats are turned off by scented litters and may choose another location for bathroom purposes. That will definitely make your house stink!
Sprinkle baking soda in the bottom of the litter box. Many people swear by this method to help minimize odors.
Change the litter frequently. Experts recommend a couple of times a month. Also, each time you change the litter, wash out the box with mild soap and water.
And don’t forget to replace boxes completely once a year. No matter how well you wash them, over time, plastic boxes can trap bacteria and begin to smell.