Clean the litter box daily by scooping clumps and waste
The fastest way to keep a litter box sanitary is to scoop out clumped urine and solid waste once or twice a day. Use a slotted scoop — the kind with holes that let clean litter fall back into the box while trapping waste. Scoop at an angle so litter slides through the slots, then dump the waste into a trash bag or disposal bin.
Scoop in the morning and again in the evening if your cat uses the box frequently. If you have multiple cats, scoop more often — aim for after each use if possible. A box that smells strongly of ammonia means waste has been sitting too long; daily scooping prevents this buildup.
Keep a small trash can or lined bin next to the litter box so you do not have to carry waste across your home. Seal the bag when it gets full to contain odor.
Key Takeaways
- Scoop clumped litter and waste once or twice daily using a slotted scoop, and dispose of it in a sealed bag or bin.
- Replace all litter and wash the box with hot water and mild soap once a week, or more often if you have multiple cats.
- Wipe down the inside walls and bottom of the box during weekly cleaning to remove stuck litter dust and urine residue.
- Use unscented litter or litter labeled safe for cats, and avoid ammonia-based cleaners that can irritate your cat's respiratory system.
- If odor persists after daily scooping and weekly washing, the box may be too small or your cat may have a urinary tract issue worth discussing with a veterinarian.
Replace all litter and wash the box once a week
Once a week, empty the entire box and wash it thoroughly. Scoop out all remaining litter into a trash bag. Rinse the box under hot running water to remove litter dust and dried urine. Use a soft brush or cloth with a small amount of mild dish soap to scrub the inside walls and bottom, paying attention to corners where urine pools.
Rinse the box completely with hot water until no soap residue remains — cats are sensitive to chemical smells and will avoid a box that smells like cleaner. Dry the box with a clean towel or let it air-dry for a few minutes before adding fresh litter.
If the box is stained or discolored, soak it in hot water with a small amount of white vinegar for 15 to 20 minutes before scrubbing. Vinegar cuts through mineral deposits and urine stains without leaving a strong chemical odor.
Avoid ammonia and scented cleaners
Do not use ammonia-based cleaners on a litter box. Ammonia smells like concentrated cat urine, which confuses cats and can make them avoid the box. Bleach and other harsh chemicals can irritate your cat's lungs and eyes, especially in a small, enclosed space where fumes concentrate.
Stick to hot water and mild dish soap, or white vinegar and water in a 1:1 ratio. These are safe, effective, and do not leave odors that deter your cat. If you want to disinfect the box, hot water alone kills most bacteria when you scrub thoroughly.
Choose the right litter type and depth
Use unscented clumping litter unless your cat has a specific preference or health issue. Clumping litter makes daily scooping easier because waste forms solid clumps that separate from clean litter. Scented litters can mask odor temporarily but often irritate cats' sensitive noses and do not address the underlying smell problem.
Fill the box with 2 to 3 inches of litter — deep enough for your cat to dig and bury waste, but not so deep that litter spills over the sides when your cat moves around. Too little litter means waste sits on the bottom and smells quickly; too much wastes litter and makes the box harder to keep clean.
Some cats prefer specific litter textures — clay, pine, paper, or crystal. If your cat stops using the box after you switch brands, go back to the old type. A cat that avoids the box will eliminate elsewhere in your home, which is much harder to clean.
Handle litter box placement and size
Place the box in a quiet, low-traffic area away from your cat's food and water bowls. Cats naturally avoid eliminating near where they eat. The box should be easily accessible — if your cat has to navigate obstacles or climb stairs to reach it, they may go elsewhere.
The box should be at least 1.5 times as long as your cat's body. A box that is too small forces your cat to crouch in an uncomfortable position or hang over the edge, which discourages use. If you have multiple cats, the rule is one box per cat plus one extra — so two cats need three boxes, ideally in different locations.
Check that the box is not in a corner where your cat feels trapped. Cats prefer to have an escape route while they use the box, so place it where your cat can see approaching people or other pets.
Replace the box when it becomes worn or stained
Plastic litter boxes absorb urine odor over time and become harder to clean as they age. If your box is cracked, scratched, or permanently stained despite regular washing, replace it. Odors trapped in the plastic will persist no matter how often you scoop, and your cat may start avoiding it.
Most plastic boxes last 1 to 2 years with daily use before they need replacing. Metal or ceramic boxes last longer but are less common. When you buy a new box, wash it with hot water and soap before adding litter, and place it in the same location as the old one so your cat knows where to find it.
Troubleshoot persistent odor and litter box avoidance
If your box smells strongly of ammonia even after daily scooping and weekly washing, the box may be too small or your cat may be urinating outside the box. Check that the box is large enough and that you are scooping at least once daily. If odor persists, replace the box entirely — old plastic absorbs smell that cleaning cannot remove.
If your cat stops using the box or goes to the bathroom outside it, do not assume it is a behavior problem. Cats often avoid the box because it is dirty, too small, in a bad location, or because they have a urinary tract infection or other health issue. A veterinarian can rule out medical causes. Once you have ruled out health problems, try adding a second box in a different location, increasing the size, or switching litter types.
Urine accidents outside the box require thorough cleaning with an enzymatic cleaner designed for pet urine — regular soap and water will not remove the scent, and your cat will return to that spot. Enzymatic cleaners break down the uric acid in urine so the smell disappears completely.
Frequently Asked Questions
How often should I completely change the litter?
Change all the litter once a week for a single cat, or twice a week if you have multiple cats. Daily scooping removes most waste, but litter gradually absorbs moisture and odor over time. A complete change keeps the box fresh and prevents ammonia buildup.
Can I use baking soda in the litter box?
Sprinkling a small amount of baking soda on top of fresh litter can help absorb odor, but it is not a substitute for daily scooping and weekly washing. Some cats dislike the texture or taste of baking soda and may avoid the box. Test it with a light sprinkle first to see if your cat minds.
What should I do if my cat refuses to use a newly cleaned box?
Cats sometimes avoid a freshly cleaned box if the cleaner smell is too strong or if the litter feels different. Rinse the box very thoroughly to remove all soap residue, and make sure you are using the same litter brand. If your cat still avoids it, try adding a small handful of used litter from the old box to help the new one smell familiar.
Is it safe to flush cat litter down the toilet?
Most cat litter should not be flushed, even if labeled flushable, because it can clog pipes and damage septic systems. Dispose of scooped litter in a sealed trash bag. Only specialized flushable litters designed for toilets are safe to flush, and even then, check your local plumbing guidelines first.
How do I reduce litter box odor without using scented litter?
Daily scooping and weekly washing are the most effective ways to control odor. Make sure the box is large enough, placed in a well-ventilated area, and that you are not using ammonia-based cleaners. If odor is still a problem, replace the box itself — plastic absorbs smell over time and may need replacing even if it looks clean.