# Do Enzyme Cleaners Work on Pet Urine in Carpet? What the ASPCA says about enzymatic cleaners for pet accidents, how to use one so it reaches the urine, why it must dry before pets return, and its limits. Canonical: https://kleinscarpetclean.com/pets/enzyme-cleaners-for-pet-urine/ Updated: 2026-10-02 Publisher: Klein's Carpet Cleaning Yes, when the cleaner reaches everywhere the urine went. The ASPCA advises cleaning pet accidents "thoroughly with an enzymatic cleanser designed to neutralize pet odors", and never with ammonia. Use enough to soak as deep as the urine did, leave it for the time on the label, blot, and keep pets away until it is dry, because the ASPCA says most enzyme cleaners can cause mild stomach upset. Klein's Carpet Cleaning, in Waterdown, tells you when urine has gone past the carpet into the pad. By Klein's Carpet Cleaning, Waterdown, Ontario. Last updated October 2, 2026. ## What does the ASPCA actually recommend? Two things, together. In its guidance on [urine marking](https://www.aspca.org/pet-care/cat-care/common-cat-behavior-issues/urine-marking-cats): "Clean accidents thoroughly with an enzymatic cleanser designed to neutralize pet odors. You can find this kind of cleaner at most pet stores." And: "Do not clean up accidents with an ammonia-based cleanser. Urine contains ammonia, so cleaning with ammonia can attract your cat that same spot to urinate again." The same logic applies to a dog returning to a spot it can still smell; that extension is ours. ![A plain white spray bottle beside a damp, blotted spot on a beige carpet, with a folded white cloth](https://kleinscarpetclean.com/photos/site/enzyme-cleaner-spray-on-carpet.jpg) Enough cleaner to reach as deep as the accident went. Illustration. ## How do I use an enzyme cleaner so it works? Using an enzymatic cleaner on a carpet urine spot (follow your product's label where it differs) StepWhat to doWhy 1. BlotPress white paper towel onto the spot until almost nothing comes upLess urine left means less for the cleaner to break down 2. Rinse lightlyCool water, then blot againThe CRI says to rinse urine with cool water, not hot 3. ApplyEnough to wet the carpet as deep as the urine went, a little wider than the stainThe cleaner only works where it touches the urine 4. WaitThe dwell time on the label; do not blot earlyEnzymes need time to work 5. DryBlot the excess, then let it dry fully, with air movingThe ASPCA says to let it dry before pets return The steps are our plain sequence from the ASPCA's and the CRI's advice; the product label governs the details. ## Why must pets stay off until it dries? Because pets lick their paws. The ASPCA's guide to [household products](https://www.aspca.org/pet-care/aspca-poison-control/poisonous-household-products) says: "Most enzyme-based cleaners tend to cause mild stomach upset so ensure that these products dry prior to letting the pet into any area where they were used." Close the door or put up a gate until the spot is dry to the touch. ## Can I use an enzyme cleaner after other cleaners? Rinse first. Detergent, vinegar or any spot remover left in the pile sits between the enzymes and the urine, and some products may not work well together; read both labels. Never mix anything with bleach: Transport Canada's [CANUTEC](https://tc.canada.ca/en/dangerous-goods/canutec/articles/improper-mixing-common-household-cleaning-products) warns that urea in urine reacts with bleach to form chloramine compounds. The full stain sequence is in [getting urine out of carpet](https://kleinscarpetclean.com/pets/pet-urine-out-of-carpet/). ## When will an enzyme cleaner not be enough? When the urine reached the pad or the subfloor and the cleaner cannot follow it there, which is common with old spots and with a pet that has used the same place for weeks. The sign is a smell that returns on humid days after the surface looks clean. At that point the honest options are a professional assessment and, often, pad replacement; see [pet urine and odour](https://kleinscarpetclean.com/residential/pet-urine-and-odour/). A spot that keeps getting used is a behaviour question too: [why a pet keeps using the same spot](https://kleinscarpetclean.com/pets/pet-keeps-peeing-on-same-spot/). ## Get a free carpet cleaning quote Tell us which rooms, how many stairs, and about any pets or stains. We reply within one business day, by phone or email, and the quote is agreed before anyone starts. [Request a free quote](https://kleinscarpetclean.com/quote/) [Call 289-776-7299](tel:+12897767299) ### The short version - Enzyme cleaner, never ammonia - Soak as deep as the urine went - Wait the full dwell time - Pets off until dry - Returning smell means the pad ## Pets and carpet - [Carpet care for pet owners](https://kleinscarpetclean.com/pets/) The whole section: accidents, hair, fleas, mud and safe cleaning. - [Cleaning pet vomit out of carpet](https://kleinscarpetclean.com/pets/pet-vomit-out-of-carpet/) Lift it first, then the solutions in order, and the spot kit mistake. - [Cleaning dog poop out of carpet](https://kleinscarpetclean.com/pets/dog-poop-out-of-carpet/) Firm, soft and dried accidents, and what not to reach for. - [Pet hair and dander](https://kleinscarpetclean.com/pets/pet-hair-and-dander/) Why the allergen is not the hair, and what actually removes it. - [Fleas in carpet](https://kleinscarpetclean.com/pets/fleas-in-carpet/) What Health Canada says to do, and where carpet cleaning fits. - [Muddy paw prints](https://kleinscarpetclean.com/pets/muddy-paw-prints-on-carpet/) Wet or dry first, the two-step CRI method, and stopping it at the door. - [Is carpet cleaning safe for pets?](https://kleinscarpetclean.com/pets/pet-safe-carpet-cleaning/) Products, drying, birds, and when to keep pets out of the room. - [Carpet, dust mites and allergies](https://kleinscarpetclean.com/guides/carpet-dust-mites-and-allergies/) Health Canada's steps for dust and allergens in carpet. ## More guides - [How often should office carpet be cleaned?](https://kleinscarpetclean.com/guides/how-often-to-clean-office-carpet/) Vacuuming, interim and restorative cleaning by daily foot traffic, from Interface's chart. - [Can carpet tiles be cleaned, or do they need replacing?](https://kleinscarpetclean.com/guides/can-carpet-tiles-be-cleaned/) What Interface, the carpet tile maker, recommends, and the machine that can void its warranty. - [What is encapsulation carpet cleaning?](https://kleinscarpetclean.com/guides/encapsulation-carpet-cleaning/) How the low-moisture crystallizing method works, how long it takes to dry, and its limits. - [How much matting does a building entrance need?](https://kleinscarpetclean.com/guides/entrance-mats-for-carpet/) Six feet as a floor, fifteen feet for 80% of soil, and how to look after the mats. [All cleaning guides](https://kleinscarpetclean.com/guides/)