We have several cats and have never been successful at removing odors with OdoBan. Try OdorXit. Their website is http://www.odorxit.com/Cats.htm
Recently we introduced a new cat to the house. Our older female took offense to this and started using the carpeted floor under my daughter's bed as her litter box. I first cleaned the area by hand then followed up with a steam cleaner using the carpet cleaning solution and OdorXit. The results were amazing. The product is expensive but is extremely effective when used as directed.
It also works good in refrigerators. We had some frozen hamburger stored in the fridge in our camper. The power cord was accidentally disconnected allowing the hamburger to thaw and run throught the fridge. The smell was awful! I cleaned the inside of the fridge well with Lysol Kitchen Cleaner followed up by a good application of the OdorXit Magic. By the next day, the offensive odor was completely gone.
I realize that I sound like some cheap infomercial but I've never run across a product that works so well. Try it, you'll be amazed!