How to get pee out of a mattress comes down to two rules: act fast and use an enzyme cleaner. Whether it's a potty-training kid, a pet, or an adult accident — fresh or long dried — here's exactly what to do, and the one product that actually removes the smell instead of masking it.
Get sheets and the protector into a hot wash right away. Speed matters — the longer urine sits, the deeper it soaks and the harder the smell is to remove.
Press a dry towel firmly into the wet area to soak up as much liquid as possible. Stand on it if you have to. Rubbing just pushes urine deeper into the foam.
Spray generously so the cleaner reaches as deep as the urine did — under-treating is the #1 mistake. Let it sit the full time on the label (usually 10–15 minutes).
Blot up the cleaner, then sprinkle baking soda over the damp spot to pull out remaining moisture and odour. Leave it several hours — overnight is ideal.
Vacuum up the baking soda and let the mattress dry completely (a fan helps) before re-making the bed.
Old urine has dried into crystals you need to reactivate. Lightly mist the stain with water first so the enzyme cleaner can penetrate.
Saturate the area and — this is key for old stains — leave it for a long contact time. Many people cover it with plastic wrap for a few hours so it doesn't dry out before the enzymes finish working.
Blot, deodorise with baking soda overnight, vacuum. Deep-set stains often need two rounds — don't be surprised if the smell returns faintly after drying and needs one more pass.
Once it's clean and dry, put a washable waterproof mattress protector on. The next accident lands on something you can just throw in the wash — especially worth it for kids' and pets' beds.
More: the full how to clean a mattress routine · blood stains · yellow sweat stains. If the smell won't ever fully leave the foam, it may be time for a new mattress.
Practical stain-removal tips — not medical advice.
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