I have used the product for over a year. 3 cats and 3 dogs and I don’t know who needs to be corrected! I went away for 2 weeks and had a pet sitter. When I got home I could smell it!! The cats were upset about me! But where was the odor coming from? Looked for my black light but couldn’t find it so had to go with sniffing it out. Last night I rolled up area rug in dining room and started spraying My Pet Peed. This morning I moved some furniture and rolled some more. And I found it! Obviously it’s been going on for quite a while. So I used up what I had of MPP and ordered more! Probably will need more than one treatment. I will update tomorrow. I hope I can save the rug!