There are several specialty products to completely clean stains from cats. These products are often over-priced as they are gear specifically to focus on cat urine. But, anyone who has tried these items know they don't work. Often times, they may be watered down, soapy, or higher scented. I can not show you the number of products I used before I finally found one that worked. Some would get rid of the stain, until it absolutely was dry and I just realized the stain wasn't gone, it had been just watered down. Some would remove the smell, but only by masking it which has a pine or citrus smell. Once that masking smell faded, the urine smell would be in the same way strong since the day it was discovered.