My very large dog had taken to wetting the carpet under the large window in my living room and hiking his leg on my curtains. Washing after washing curtains, and cleaning carpet with countless carpet cleaners, I could still smell pet urine and still had yellow stains. I had seen this advertised and thought I would give it try. Mostly great reviews. Let me say, I have been throughly pleased with the results of this product. It has taken out the yellow stains, the stains on my curtains, the pee pee odor, and the carpet looks fantastic. There have been no issues with discoloration on the carpet or my curtains. My big boy had a bladder infection and just could not hold it. I guess because he had gone in a certain area, he thought it was his go to bathroom spot. Now, no more accidents, no smell, no stains on the carpet. This will definitely remain in my cleaning products from now on. My husband and I were looking to replace the flooring, not now after using this product. Would highly recommend this product!