I had my doubts (tried nearly everything), but this stuff is the real deal! We have a nervous shih tzu that pees in front of his crate and patio door when left alone and our male cat started marking around that area. After one application, the stains are nearly gone and my carpet looks brand new in several spots! This was a large area, too, and I still have 3/4 of a spray bottle left. I should mention we even had our carpet professionally cleaned, and the stains came back. I will forever buy this stuff and encourage others to do so!