I have a cat that had started to pee outside the litter box but only in the cats’ room on old carpet. I thought I just wasn’t finding the right spot and then I found that she had done it several times. You can’t see where on that carpet so I was struggling with not knowing right where to treat. I sprayed a large area and it helped me cut down on the odor. Yesterday morning I could smell that she did it again. I found right where she did it and I sprayed this great product as directed and was amazed how much it helped. I ordered a second bottle of it because I am treating a large area and I can tell that it is going to take care of it. I highly recommend this product. It smells bad right after you spray it but that is because it is working and it goes away pretty quickly.