Instruct: Classify the given review as either positive or negative.
Query: GREAT product!

I had tried MANY products for my male cats 'marking' problem, and had sporadic luck with them. But this product does really seem to take away the smell - which is what I ultimately wanted! There are times when I have to go back and put some more over the spot, but the smell does usually go away after that. I am very impressed with this product!!I can not, however, tell if it prevents him from marking on that spot again, because I have now had to resort to a wireless 'invisible fence' system in our house!