"My 19 yo cat decided to stop using the litter box last Dec as the hard surface floors were much nicer in her opinion (linoleum, tile, hardwood). Even though I was diligent in cleaning up the urine, it had seeped into grout lines & between the hardwood cracks. I had even used Nature's Miracle, but recently with the rise of humidity with the arrival of Spring, the house really started to smell (with visitors commenting on it.). While I love my cat, I couldn't justify reflooring the house for her. I bought this as a last ditch effort, without any expectations, & Oh my Gosh!!! it works!!! My house doesn't smell anymore. I'm buying a case of this stuff!"