1. Urea – Sticky stuff

2. Urochrome – Pigments which give it color

3. Uric acid – The stinky part

This is the point at which you will need a specifically designed cat urine remover. The most effective products rely on bacteria and enzymes to actually eat up the last remnants of the Uric Acid and thus rid your home of the unpleasant odor. There are several of these products, such as "Simple Solution Cat Spray & Urine Stain & Odor Remover" which is available at PETCO. Many home remedies will recommend the use of vinegar to remove the smell. I have never tried this, but those who have tend to give mixed reviews to the process. Truly effective removal does seem to depend on the use of bacteria and enzyme based products.

A word of warning here. No matter what anyone may try to tell you about how to clean cat urine from carpets or furniture, do NOT ever try to use a product with ammonia in it as a cat urine cleaner. Cat urine contains ammonia, and by using that product, you have just provided a marker for your cat telling it where to do its business next time.

Sometimes, finding the offending spot can be difficult. One trick is to search with a black light. Remember, you will probably not be looking for a large puddle, particularly on carpet. The urine will have come out in a stream, so the actual spot visible in the black light may not be much larger than a pencil eraser. However, the problem will be that once in the carpet, the cat urine will seep into the backing, the pad, and possibly through to the floor itself. To effectively remove the cat urine smell and prevent further visits to that spot by your cat, it may be necessary to lift the carpet and clean the pad and the floor as well as the carpet itself.
References :
http://www.abcarticledirectory.com/Article/How-To-Clean-Cat-Urine/36369

It has worked on cat urine smell that was impenetrable to removal by every commercial preparation on Petco's shelves AND to Oxy Clean.

I saw the episode where they tried it on skunk odor ( and it was effective ) and thought, if it works on that, how would it work on old cat funk? It worked WONDERS! I didn't have to throw out a pet carrier I was THISCLOSE to throwing out! We were at our wits end!

MythBusters, the hydrogen peroxide mix was found to be the most effective smell removal agent.[6]

From Popular Science Aug. 1995, chemist Paul Krebaum provided the recipe for the bathing concoction. One quart of 3% hydrogen peroxide, one quarter cup of baking soda, and one teaspoon of liquid soap. then rinse with tap water. There is no way to store this potion. If you put the ingredients in a bottle, the whole thing would explode.

If the cat is still urinating outside the litterbox after a couple of days she really needs to take it to a vet as the stress of the move may have predisposed it to a urinary tract infection.

Peeing outside the litterbox is the hallmark symptom of cystitis, and could indicate either minor or major kidney problems, too.

It won't allow me to post the wikipedia or mythbusters links below

EDIT: I had ALREADY STATED that every odor removal product available at PETCO had NOT worked when I tried the method I recommend, and that INCLUDED Simple Solution Cat Spray & Urine Stain & Odor Remover that was posted AFTER my entry. I also purchased every odor removal product for sale at Wal Mart. I had a cabinet full of ineffective products before I discovered the best solution. I had well over $100 on various products. I had a male cat with kidney failure who urinated in inappropriate places before he died. The only thing that worked with 100% efficacy was the baking soda/peroxide mixture. There may be fabrics that it could bleach so be careful.

I found other uses for those pet odor removal products, however. They were effective for trash can odors and they were also useful for my husbands muddy work boots..and son's sweaty sneakers. They were ineffectual for cat urine smell. I have a sensitive nose for odors.

BEFORE you waste your money purchasing products that don't work..try the more inexpensive method and I KNOW you will be happy with it!
References :

There is a product called Kids n Pets that is good. You can get it from Amazon.com:

http://www.amazon.com/s/ref=nb_ss_gw/103-3401169-2274238?initialSearch=1&url=search-alias%3Daps&field-keywords=kids+n+pets&Go.x=0&Go.y=0.

I also found it at my local Walmart.

Hope this helps!
-Peace
References :