How to Get Cat Urine Smell Out of a Mattress
The short answer
Cat urine on a mattress requires enzyme cleaner labeled for pet urine or cat urine, applied with controlled moisture — not flooded — and thorough drying. Cat urine contains compounds that make its odor unusually persistent, and standard cleaners do not break them down. Enzyme cleaners formulated for pet urine do. Because mattresses absorb liquid into foam or padding layers, over-wetting is a real risk: you want the enzyme cleaner to reach the contaminated depth without soaking the inner core. Plan for multiple treatment cycles, and do not evaluate the result until the mattress is completely dry.
Before you start
You need: enzyme cleaner labeled for pet urine or cat urine (the label should state it treats urine odor — a general enzyme cleaner may not contain the specific enzymes needed), clean white cloths, a fan for drying.
Identify your mattress type:
Memory foam, gel foam, or all-foam mattresses: these absorb liquid into their structure and cannot be squeezed or wrung out. Apply enzyme cleaner with a cloth rather than pouring directly, and use only enough to saturate the contaminated surface area — not enough to run down into the core.
Spring or hybrid mattresses (with a foam comfort layer over springs): more forgiving than all-foam, but still apply with control. The inner spring layer can hold moisture for a long time if over-wet.
Fresh vs dried urine: fresh urine needs to be blotted up before applying enzyme cleaner. Dried urine should be lightly dampened with cool water first to rehydrate the deposit before enzyme treatment.
Steps
For fresh urine:
Blot up as much urine as possible immediately with clean white cloths. Press firmly and lift straight up — do not rub. Replace cloths as they absorb urine. Remove as much liquid as possible before applying anything.
Apply enzyme cleaner to the stained area. On a foam mattress, apply using a cloth: dampen the cloth with enzyme cleaner and press it onto the stained surface rather than pouring directly. Apply enough that the enzyme cleaner penetrates to the depth the urine reached, but do not flood the mattress.
Let the enzyme cleaner dwell for 15–20 minutes. Place a damp cloth over the treated area to slow evaporation in warm rooms.
Blot away as much moisture as possible with clean dry cloths.
Direct a fan at the treated area and allow it to dry completely — several hours minimum, often longer for foam. Do not replace sheets, a mattress protector, or any cover until the mattress is fully dry.
Once completely dry, check for odor. If odor remains, the urine likely reached deeper layers. Repeat from step 2 with a slightly heavier application.
For dried urine:
Lightly dampen the stained area with cool water — just enough to rehydrate the deposit. Blot with a cloth; do not soak.
Apply enzyme cleaner and continue from step 3 above. Dried cat urine deposits almost always need 2–3 full treatment cycles.
What not to do
- Do not over-wet the mattress. Flooding a foam mattress with liquid saturates the inner structure, creating conditions for mold that cannot be treated from the surface. Apply enzyme cleaner in a controlled amount.
- Do not use a steam cleaner or apply heat. Heat bonds uric acid crystals to the material and makes the odor permanent.
- Do not use ammonia-based cleaners. Ammonia smells similar to urine and can draw cats back to the same spot.
- Do not use chlorine bleach. It does not break down uric acid compounds and can produce harmful fumes if it contacts urine residue.
- Do not replace the mattress cover or put bedding back before the mattress is fully dry. Sealing in moisture leads to mold.
- Do not evaluate smell while the mattress is still damp. A damp foam mattress will smell worse than it actually is once dry.
When the treatment may not be enough
If odor returns reliably after two or three full treatment-and-dry cycles, the urine has likely reached deeper into the mattress than surface enzyme treatment can address.
For spring mattresses, professional upholstery or mattress cleaning services use equipment that can saturate and extract more deeply than hand application. This is worth considering for repeated accidents in the same spot.
For foam mattresses where urine has reached the core: foam cannot be rinsed through and cannot be fully dried once the inner layers are saturated. In this situation, replacement of the mattress is often the honest answer.
A waterproof mattress protector will prevent future accidents from reaching the mattress itself. Fitting one after successful treatment is a practical prevention step.
Frequently asked questions
What if the cat urine reached deep into the foam core of my mattress?
If the cat urinated repeatedly in the same spot, or the accident sat untreated for a long time, the urine may have soaked into the foam core. Surface enzyme cleaner treatment cannot reach it. For spring mattresses, professional mattress cleaning may help. For all-foam mattresses where urine has saturated the inner layers, replacement is often the most realistic outcome — foam cannot be rinsed through and cannot dry once its inner structure is saturated.
Why does cat urine smell worse than dog urine?
Cat urine contains felinine, an amino acid that breaks down into sulfur-containing compounds over time, particularly in warm or humid conditions. These compounds are responsible for the distinctive, persistent odor. This is also why the smell can seem to return when the area gets damp — the compounds are reactivated by moisture. Enzyme cleaners formulated specifically for pet urine or cat urine target these compounds.
Not sure if this approach is right for your situation? Use the Stain Rescue Tool to get a personalized step-by-step plan based on your stain, surface, and what you have at home.
Use the Stain Rescue Tool