How to remove cat urine stains and smell
To remove cat urine stains and smell, blot up as much as you can, rinse with cool water, then soak the spot with an enzymatic pet-urine cleaner and let it air-dry. Cat urine contains a compound that breaks down into a sulfur-smelling thiol, and bacteria add ammonia as it ages, so masking sprays fail and only removing the residue works. Skip steam, heat and strong-smelling cleaners, which set the odor or invite the cat back.
- Best method
- Blot, rinse cool, enzymatic cleaner, air-dry
- Time
- 30 minutes of work, plus several hours to dry
- Difficulty
- Moderate
- Stain type
- Protein
You will need
- Paper towels and newspaper
- Cool water
- Enzymatic pet-urine cleaner
- Black light (UV flashlight)
- Disposable gloves
How to remove cat urine stains
- 1
Blot up everything you can
Cover a fresh spot with a thick layer of paper towels topped with newspaper and stand on it for about a minute. Repeat until the area is barely damp. Rinse washable items in cold water right away.
Why: Every bit of urine you remove before it dries is residue that can't turn into odor later.
- 2
Rinse with cool water
Pour or sponge clean, cool water onto the spot and remove it by blotting or with a wet-vac. Never use hot water or steam.
Why: Rinsing dilutes what's in the fibers. Heat bonds urine proteins into synthetic fibers and sets both the stain and the smell.
- 3
Soak with an enzymatic cleaner
Test the enzyme cleaner on a hidden spot, then apply enough to reach as deep as the urine went, padding or cushion included. Don't rinse or wipe it off. Soak washable items in cold water with the cleaner before washing.
Why: The enzymes need contact time and moisture to break down the organic residue that bacteria feed on and that produces the odor.
- 4
Let it air-dry completely
Leave the area to dry naturally, with a fan or open window if possible, and keep the cat out of the room. Air-dry washed items instead of using the dryer.
Why: The cleaner keeps working as it dries, and some smell remains until it's fully dry. Dryer heat can bake leftover odor in.
- 5
Find hidden spots with a black light
In a dark room, scan floors, baseboards, walls and furniture with a UV flashlight and outline any glowing patches with chalk. Treat each one.
Why: Urine contains compounds that glow under UV light, so dried spots you can't see show up. Other things can glow too, so sniff to confirm.
- 6
Repeat and protect the spot
If the smell returns once the area is dry, treat again. Then keep the cat away from the spot, for example by covering it, until the smell is gone.
Why: Cats can smell residue that people can't and tend to return to spots that still smell of urine.
Why cat pee smells so strong, and why it comes back
Cat urine contains felinine, a sulfur-containing amino acid made only by cats. Felinine itself doesn't smell, but it breaks down into a volatile thiol, a sulfur compound with a strong, skunky odor. Intact males make far more of it, so unneutered tomcat spray smells worst. On top of that, bacteria break urea down into ammonia as the urine ages, and uric acid salts dissolve poorly in water, so dried residue clings to fibers and padding. Like other protein stains, it sets with heat.
That's why masking sprays fail. The Carpet and Rug Institute notes that cat urine odor tends to get stronger over time and can return in humid weather, and that complete odor removal is unlikely unless all the urine is removed. Enzymatic cleaners digest the residue instead of covering it.
How it changes by surface
Washable items such as bedding, a duvet cover or clothes get a cold enzyme soak and a normal wash. A down or fiber-filled duvet needs the filling treated too, so check its care label; many are too bulky for a home machine. Carpet is the hardest because urine wicks into the padding; see cat urine on carpet. Couches and mattresses need the cleaner pushed as deep as the urine went, with as little extra water as possible.
Wood is different. Urine acids react with varnish and paint, and if the finish has discolored, an enzymatic cleaner won't fix it. The finish or boards may need refinishing or replacing; see cat pee on wood.
Cat urine on every surface
The method changes with the surface: fabrics can soak, carpets and mattresses can't. Pick yours for the full steps.
| Surface | What works |
|---|---|
| Carpet | Blot, cool rinse and extract, enzymatic cleaner, air-dry |
| Clothes | Cold rinse, enzyme presoak, long wash, air-dry |
| Couch | Cold-water flush, enzymatic cleaner deep into the cushion, air-dry |
| Mattress | Blot and extract, enzyme cleaner, air-dry |
| Wood | Blot, finish-safe cleaner, enzyme cleaner, dry; refinish if discolored |
| Soft furnishings | Blot, rinse with cool water, then saturate the area the urine reached with an enzymatic cleaner and let it air-dry; removable covers can be soaked and washed cold, but the cushion or filling underneath usually needs treating too. |
By situation
Fresh accident versus old, dried urine
Fresh urine can mostly be blotted out before it reaches padding or foam. Dried urine has to be rehydrated first: soak the spot several times, then apply the enzymatic cleaner. If urine soaked into carpet padding, the Humane Society of Sonoma County notes that section of carpet and pad may have to be replaced.
It still smells after washing
Soak again in cold water with an enzymatic cleaner, rewash on a cold cycle and air-dry. Don't machine-dry until the odor is completely gone.
How to clean a duvet after cat pee
Strip the cover and wash it separately after a cold enzyme soak. Blot and rinse the duvet itself, then treat the wet area with enzymatic cleaner and air-dry it fully. If the care label allows washing and it fits your machine, wash it cold; otherwise take it to a professional cleaner and tell them it's urine.
You already tried other cleaners
Residue from earlier cleaners, steam or other chemicals weakens enzyme cleaners. Humane society guidance is to clean the area with an oxidizing pet cleaner first, rinse, then apply the enzymatic cleaner.
Whites versus colors
After the enzyme soak, chlorine bleach on whites if the label allows, or oxygen bleach on colors after a test. Silk and wool can't take enzyme presoaks or chlorine bleach: rinse with cold water and take them to a dry cleaner.
What not to do
- Don't steam-clean or use hot water. Heat sets the odor and stain by bonding urine proteins into synthetic fibers, and steam can push the spot deeper into padding.
- Don't use ammonia or vinegar cleaners where the cat went. Urine itself gives off ammonia. Humane societies warn these smells don't remove the odor for the cat and can encourage it to go there again.
- Don't mix chlorine bleach with ammonia or vinegar. Bleach and ammonia make chloramine gas, and bleach and vinegar make chlorine gas. See never mix these cleaners.
- Don't rely on fragrance or masking sprays. The urine stays put, and the smell returns, especially in humid weather.
Other methods that work
Dish detergent and vinegar (carpet stain method)
The Carpet and Rug Institute's stain method blots on ΒΌ teaspoon of liquid dish detergent in a cup of lukewarm water, rinses, then follows with 1 cup white vinegar in 2 cups water and dries under weighted paper towels.
Caution: This lifts the visible stain; CRI recommends enzyme treatment for odor. Humane societies warn a vinegar smell can encourage re-marking, so the sources differ.
Baking soda
Often sprinkled to absorb moisture and odor, but no cited source recommends it for cat urine. Treat it as traditional, with weak evidence.
Caution: It doesn't break down residue. Vacuum it all up.
3% hydrogen peroxide
An old government bulletin used it as a mild bleach on urine stains. It's traditional, with weak evidence for odor.
Caution: It can lighten dyes and carpet, and humane society guidance lists it among products that interfere with enzymatic cleaners.
Stain still there?
The smell comes back on humid days
Urine is still in the padding or cushion. Rehydrate the area, apply enzymatic cleaner deep enough to reach it, and let it dry fully. Replace the pad if it's saturated.
A yellow, red or orange mark appeared weeks later on carpet
The Carpet and Rug Institute notes urine can attack carpet dyes, especially the blue dye in beige carpet, and that this color change may be permanent. A carpet professional may be able to spot-dye or patch it.
The cat keeps going back to the same spot
Some odor is left that the cat can detect. Re-treat with enzymatic cleaner, check with a black light, and ask a veterinarian about medical or litter-box causes.
Safety
- Wear gloves and wash your hands after cleaning urine.
- Test enzymatic and oxidizing cleaners on a hidden area first for staining.
- Ventilate small rooms while you clean.
Never mix cleaning products; see chemicals you must never combine.
Questions
Will vinegar get cat pee smell out?
It isn't the best choice. Humane society guidance warns vinegar doesn't remove the odor from the cat's point of view and can encourage re-marking. An enzymatic cleaner breaks the residue down instead.
Why does cat urine smell worse than other urine?
Cat urine contains felinine, which breaks down into a pungent sulfur compound, and bacteria add ammonia as it ages. Unneutered males produce much more felinine.
How do you get cat pee out of wood?
Blot, wipe with a barely damp cloth and test an enzymatic cleaner if the finish is intact. If the finish has discolored, urine has reacted with it and the area needs refinishing or replacing.
Does a black light really find cat urine?
Usually. Urine contains compounds that glow under UV light, even when dried. Other substances glow too, so confirm by smell before treating.
Can old cat urine stains be removed?
Often the smell can, with repeated enzyme treatments that reach the padding or cushion. Color damage to carpet dye or wood finish may be permanent.
Other protein stains
Sources
- Removing Pet Odors and Stains, Humane Society of Sonoma County
- Pet Urine and Carpet (Technical Bulletin), Carpet and Rug Institute
- Elucidation of the mechanism of urinary odor production in cats, Iwate University (Yamashita)
- Stain Removal Guide, American Cleaning Institute
- Removing Pet Stains and Odors, Humane Society of Southern Arizona
- Chlorine gas: What happens if you mix bleach and other cleaners, Poison Control (National Capital Poison Center)
Last updated . Methods are drawn from the sources above; how we research and check our guides.