What you need to understand is that just washing the object can be a pain and sometimes you are left with stains or even a smell that lingers.
So what do you do?
Read the following to find out how you can get cat urine smell out of carpet....
Step 1. If the cat has recently urinated on the carpet, first absorb as much of the cat urine as possible using paper towels or an old towel. Place clean paper towels over the cat urine area and tread on them so as to absorb as much of the urine as possible. Repeat with dry towels until no more moisture can be absorbed.
Areas of cat urine that have dried and previously gone undetected can be found with the aid of a black light. The cat urine stains will fluoresce under the ultra violet light in a darkened room. Hand held black lights are quite inexpensive, usually costing between $15 - $25. To save the expense of a black light you can always use your nose to detect the source of the odor. Put your nose down close to the carpet and sniff away.
Step 2. Next, wet the area with a solution of 50% white vinegar and 50% water. Make sure you use enough of the solution to penetrate the fibers deep down. After the vinegar treatment dry off the carpet as much as possible. You can assist drying by blotting with paper towels as described above. If you own a wet/dry vacuum extractor use that to remove excess moisture.
Taken from http://www.catsofaustralia.com/urinestainremoval.htm#.UFjbaqDhfDs
Step 3. Apply a handful of baking soda over the affected area. Mix a quarter of a cup of 3% hydrogen peroxide with a teaspoon of liquid dishwashing detergent and drizzle this solution over the baking soda. Alternatively you can use a spray bottle for the hydrogen peroxide solution.
(Do not use caustic detergent that you put in a dishwasher)Work it well into the carpet with a scrubbing brush, tooth brush or your fingers. Allow to dry.Once completely dry vacuum up the dried baking soda. Use a hard bristled brush to loosen up the baking soda if necessary. You can assist drying with a heater or a fan.That's all there is to it. It's as simple as that. 1-2-3 cat pee smell gone. It really does work.Caution: Do not use hydrogen peroxide that is stronger than 3% or stronger than 10 Volume. Bleaching may occur on some carpets with stronger solutions. A spot test in an inconspicuous area is advised.