I'm a landlord. We recently had a tenant moved out and I couldn't get rid of the dog pee smell. I was worried I would have to replace the carpet, again! I was so skeptical. Especially after the first application made my sinuses burn and I wanted to vomit. but after applying twice a day for three days, the smell is gone in one section and nearly so on another. I think a day or two more and the smell will be completely gone. I can't believe it. This stuff really works!