How to Remove Pet Urine Smell from Carpet
Pet urine is one of the most challenging carpet odours to fully eliminate. The smell comes from uric acid crystals in dried urine — these crystals reactivate with moisture (humidity, cleaning) and release ammonia gas, which is why the smell often gets worse in damp weather. Effective removal requires breaking down the uric acid, not just masking the odour.
Fresh Accidents
Blot — do not rub — the area with paper towels or a clean cloth, pressing firmly to absorb as much liquid as possible. Rubbing spreads the urine and pushes it deeper into the carpet fibres and pad. Place a thick stack of paper towels on the spot, stand on it for 60 seconds, and repeat with fresh towels until no more moisture transfers.
Enzymatic Cleaner — The Most Effective Method
Enzymatic cleaners (such as Nature's Miracle or Rocco & Roxie) contain live bacteria that produce enzymes specifically designed to break down uric acid at the molecular level. Apply generously — soak the area, as the cleaner needs to reach the same depth as the urine. Keep the area moist for 10–24 hours (cover with plastic wrap to prevent evaporation). The bacteria need time to work. Do not use the area while the product is active. Let it air dry completely.
Baking Soda Follow-Up
Once the area is completely dry after enzymatic treatment, sprinkle baking soda liberally over the spot. Leave for several hours or overnight, then vacuum thoroughly. Baking soda neutralizes any remaining odour-causing compounds and absorbs residual moisture.
What Not to Do
- Do not use steam cleaners on urine stains — heat sets the proteins in urine and makes the smell permanent
- Do not use ammonia-based cleaners — the smell attracts pets back to the same spot
- Do not use bleach on carpet — it discolours fibres and does not eliminate uric acid
- Do not apply enzymatic cleaner over other cleaning products — they deactivate the enzymes
Old or Repeated Stains
For old or repeated accidents that have soaked into the carpet pad, over-the-counter enzymatic cleaners may not be sufficient — the pad often needs to be replaced. Use a UV black light (available at pet stores) in a darkened room to find all affected areas, which glow yellow-green.
Professional Carpet Cleaning in Toronto
For large areas or repeated pet accidents, Maidless Toronto offers deep cleaning that includes carpet treatment. Book at maidless.ca.