"I have two cats, and over the past 4 years, one of them (maybe both?!) has developed the bad habit of peeing where they shouldn't on occasion. I tried EVERYTHING to get the urine odor out and stop them from going in the same area - and, when I finally tried Nature's Miracle - WOW!
It takes a while for the product to work (as described on the label), and it can make the smell stronger for the first while - but, as the label indicates, this product works as it dries - so, until the area is completely dry, there will be a smell.
To one of the previous reviewers that didn't have any luck with this product - my advice is give it another try. Saturate the area, cover the treated area with tinfoil, with holes punched in it, and put some dishes containing dry food on and around the tinfoil. Keep the food dishes full until the treatment is done. In my experience (in my basement, on carpeted concrete) it can take up to 8 weeks for the area to dry completely and for the smell to be completely eliminated. But, once it's gone, it's gone - and your cats will NEVER go there again!
It's the only thing that has worked for me - and the only product I use."