From the video · odour

If the smell comes back, you cleaned the wrong layer

You came here from a video about a house that smells like an animal no matter how much you clean. This is the part that's usually missing.

The short version: if the smell comes back, you cleaned the surface and left the source. Urine soaks through carpet into the pad and, in a lot of houses, wicks up into the baseboards. Soap and scented sprays sit on top of that. Humidity brings it back every time.

Enzymes, not soap. And not vinegar.

Enzyme cleaners contain bacteria that consume the uric acid crystals that carry the odour. Soap moves them. Vinegar is acidic, and so is cat urine — to a cat, a vinegar-treated spot can read as freshly marked, which is exactly why the same spot gets hit again.

The part almost everyone gets wrong is the method, not the product:

The order that actually works

Soak, don't spray. Use enough that it reaches as deep as the urine did. A light misting treats the carpet and ignores the pad.
Cover it and leave it 8 hours. Enzymes need contact time. A towel on top stops it evaporating.
Do not use a steam cleaner first. Heat sets the protein and you lose the stain permanently.
Blot, never scrub. Scrubbing pushes it into the pad.

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Stopping it building up again

Odour in a carpet isn't only urine. Trapped hair and dander hold it too, and a vacuum whose brush roll has stopped turning leaves most of that behind — which is why the room smells faintly of animal a week after you cleaned. Same two specs decide it: an anti-wrap brush roll, and a bin you'll actually empty.

Compare the pet-hair vacuums →

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If it's a cat, and it keeps happening

Cleaning is damage control. Repeat marking in the same area is a behaviour problem and cleaning it forever is exhausting and expensive. Two things to rule out first, both free: a litter box in a spot where the cat can be cornered, and fewer boxes than cats. If neither is it, there's a program specifically for the behaviour side.

Read about the behaviour fix →

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The 8-hour method, written out

One page, printable, with the four steps in order and the two mistakes that undo the whole thing. Free.

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