I am coming back for more after I ran out of my first 300ml concentrate bottle. My Great Dane puppy is finally house trained and, thanks to PetLab, I still have a fresh smelling living room carpet! Each time the enzyme cleaner removed the smell of dog wee 100% in just one application. I also have a geriatric cat who sometimes confuses my thick woollen kitchen runner with a patch of grass 😱. Due to the thickness of the carpet and the intensity of cat wee smell, there was still some smell left after the first application. After the second, hardcore one (really soak the carpet in mixture, roll it up, cover it in black tarp and place in sun so the enzymes work in overdraft), the smell is gone. Thanks PetLab, I really love this runner!