So I never had an issue with my cats marking territory until 2 weeks ago I went on vacation and the cats were not happy. I got home to cat urine everywhere. You name it living room carpet, 3 brand new area rugs and entrance rug. I tried everything to get rid of the smell Rocco and Roxie, Nature’s Miracle, Out odor remover, Woolite Cat urine carpet cleaner to name a few. The odor was gone for 48 hours but it returned stronger than ever. As a last option, I googled guaranteed urine remover products and pet peed info came up so I figured let me try this last thing before I have to replace my first floor flooring which isn’t cheap. I bought their starter kit and the light, used the product twice in all areas there was cat urine. the first 72 hours the cat urine smells was stronger than ever but after the area dries out tadaaah the urine smell is gone. Worth every darn penny, this is going to be my to go to product moving forward.