Even after thorough cleaning, the urine of a cat can leave your floors, furniture, and linen smelling foul due to its concentrated strength. Urine bacteria decompose over time, releasing an ammoniacal odor that is characteristic of old, stale urine. In order to get rid of this smell, you'll have to use a lot of elbow grease. It is possible to remove old cat urine from clothing, carpets and walls using simple home remedies that don't require any chemicals. These odor-neutralizing solutions are not only easy to make at home, but they are also guaranteed to be effective!