Still Smells of Urine

[Matthew Louks]

I bought a fixer upper about 2 months ago. They had cats! And carpet. Well after demoing half the sheet rock,and pulling the carpet, most of the smell was gone. Of course there were stains in the hardwoods. After vinegar, baking soda, and peroxide before refinishing the hardwoods the smell seemed to all but disappear. So.... I assumed, good to go. We finished the hardwoods, and the whole house. However, I may have been in the house too many hours of the day along with the other guys working for me. Had a friend stop by to see the progress, and he smells cat urine, without any knowledge of what I ran into initially. *&#@! So now i need a fix. One that doesn't involve ripping up any of the work that's complete.  Biggest problem is that I'm beginning to run low on cash. My initial thought is trying to spray the floor joists in the basement with vinegar. I'm trying to avoid spraying all the floor joists with a shellac based primer. Any simple, cost saving solutions would be much appreciated. Thanks