Cat urine is one of the worst smelling substances on the planet and stains left behind are harder to clean off than ketchup from your shirt. To understand why, you need to go beyond regular world understanding of it. Like anything else in the world cat urine is composed of molecules of different kinds. In fact cat urine is mainly composed of 4 elements: carbon, hydrogen, nitrogen and oxygen. It's the way those elements are combined that gives cat urine that ability to produce stains and odors. There are three major components found in the pee that are worth noting. These are the Urea, the Urochrome (or Urobilin) and most significantly the Uric Acid. They serve an important part in cat's metabolism processes.
