How to Get Pet Urine Out of a Mattress

hard to removeDry: At least 6 to 8 hours upright with airflow, ideally a full dayHeat sets this stainMoisture-sensitive surface

Getting pet urine out of a mattress is possible at home but needs patience and honest expectations. The short version: cold, damp-not-wet cleaning with thorough blotting, an enzyme stage for the biology, and a genuinely complete dry before the bed is remade. Because a mattress is moisture-sensitive, keeping everything sparing matters as much as the product choice. There are situations here where a professional genuinely is the right call — they are flagged below.

What you’ll need

Recommended: Cold water and mild detergent, then an enzyme-based cleaner.

Homemade option: One teaspoon of mild detergent in 500 ml of COLD water. There is no good homemade substitute for the enzyme stage — the enzymes are the part doing the real work.

Dwell time: 10 to 15 minutes for the enzyme stage.

Step-by-step method

1
Strip the bedding immediately and blot the pet urine hard with dry white cloths — stand weight on them to pull liquid back out of the fillings.
2
Blot up as much pet urine as possible with dry white cloths, pressing firmly. Stand on the cloths to draw liquid up from the backing — fresh urine goes deeper than it looks.
3
Dab the area with COLD water on a white cloth and keep blotting dry. Cold is not optional: any warmth cooks the protein onto the fibre.
4
Mix a teaspoon of mild detergent into 500 ml of cold water, dab it on, and blot. Repeat until no more transfers to the cloth.
5
Apply an enzyme-based pet stain cleaner generously enough to reach everywhere the urine reached, and leave it to work for the full time on the label — usually 10 to 15 minutes. The enzymes need that time to digest the uric acid crystals that cause lasting odour.
6
Blot the area dry with fresh cloths, dab with plain cold water to rinse, and blot again.
7
Dry thoroughly, then check on a warm humid day: if odour returns, the crystals survive and the enzyme stage needs repeating — masking sprays only pause the problem.
8
Press the cleaned area with a stack of dry towels under a weight for ten minutes to wick out moisture.
9
Sprinkle bicarbonate of soda over the area, leave it several hours, and vacuum — it draws residual moisture and odour.
10
Stand the mattress on edge in an aired room until COMPLETELY dry — at least 6 to 8 hours, ideally a full day — before any bedding goes back on.

Why this works

Protein stains like pet urine are chains of amino acids that behave like egg white: liquid when fresh, but permanently solid once heat gets to them — which is why the whole method runs cold. The enzyme stage uses proteases, biological scissors that cut protein chains into small water-soluble fragments a blot can lift. Urine adds a second problem: as it dries it forms uric acid crystals that detergents cannot dissolve, and only enzyme digestion truly removes — which is why the smell comes back on humid days after an ordinary clean. On a mattress there is a second constraint the chemistry has to respect: no rinse stage can flush residue away, because flushing means soaking the core. That is why this version leans so hard on blotting, pressing and absorbent powder — mechanical extraction replaces the rinse.

Don’t do this on a mattress

Never use warm or hot water on pet urine — heat coagulates protein and sets the stain permanently.
Never use a steam cleaner before the stain is fully out, for the same reason.
Avoid ammonia-based cleaners: to a pet, ammonia smells like urine and invites re-marking of the same spot.
Never pour liquid onto a mattress — the core absorbs it and a damp core grows mould you will sleep over.
Always work with a damp cloth, never a wet one, however bad the stain.
Do not use bleach or solvent products on a sleeping surface.

Fresh spill vs dried-in stain

Fresh urine is mostly water and lifts well if blotted thoroughly straight away. Dried urine leaves uric acid crystals that ordinary detergents cannot break down — they reactivate with humidity and keep releasing odour until an enzyme cleaner digests them.

Dried urine has already crystallised, so skip straight to the enzyme cleaner and give it a long dwell under a damp cloth. Large or repeated accidents usually mean the pad and backing are affected, which surface cleaning cannot reach.

When to call a professional

If the stain has soaked past the surface into the core — the usual sign is the mark reappearing after cleaning — a professional mattress clean with proper extraction is the honest fix. If odour or staining is extensive, price the clean against a new mattress first.

We don’t sell cleaning or take referral fees — when we say “call a pro”, it’s because the chemistry says so. Look for NCCA-registered firms.

Pet Urine on mattress FAQs

Will pet urine come out of a mattress?

Sometimes — be honest with your expectations. Pet Urine is one of the harder stains on this surface, and complete removal is not guaranteed. A professional improves the odds considerably.

What is the best cleaner for pet urine on a mattress?

Cold water and mild detergent, then an enzyme-based cleaner. From the cupboard: One teaspoon of mild detergent in 500 ml of COLD water. There is no good homemade substitute for the enzyme stage — the enzymes are the part doing the real work.

Can I use excess water — a soaked mattress core grows mould on a mattress?

No. A mattress is a sponge you sleep on: whatever goes in stays in unless it evaporates. The two rules that matter are minimal moisture — always a damp cloth, never a pour — and thorough drying, because a damp core grows mould you will breathe nightly. Enzyme cleaners handle the biological stains that mattresses actually get.

Does heat set pet urine?

Yes — this is the mistake that makes pet urine permanent. Keep hot water, steam cleaners and hair dryers away until the stain is completely out, and let the area air dry.

How long does a mattress take to dry after treating pet urine?

At least 6 to 8 hours upright with airflow, ideally a full day. The slowest-drying surface in this guide: after damp cleaning allow at least 6 to 8 hours with real airflow, ideally a full day, before bedding goes back on.

When should I call a professional for pet urine on a mattress?

Pet Urine on other surfaces

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Guidance is general and based on stain chemistry, WoolSafe and NCCA best practice, and manufacturer care standards. Always spot-test in a hidden area first, and follow your item’s own care label where it differs.