We lived in a house 10 years ago that had what I called "CatPeeCorner" ... from one cat one time! We were too poor to re-carpet for a year, but I did a monthly dousing of Natures Miracle on the spot. No one else could smell it they said, but I could. Finally we saved up and ripped out the carpet -- I bleached the slab there before we put wood on the floors. All gone, finally!!

Hell is empty and all the devils are here.
Shakespeare