Removing cat odors from a house involves cleaning the initial mess, breaking up the smell and finishing with an odor neutralizer. The methods for removing cat odors depend on the type of surface that is soiled.
Most cat odors are the result of urine, feces or vomit. Therefore, the first step is cleaning the soiled area. If the cat urinated on carpet, soak up the urine with paper towels. If it is feces or vomit, use a scrub brush to remove the stain. Next, use an enzymatic cleaner to further break down the stain and smell. These cleaners release cultures that "eat" the proteins of the stain, according to Pet Finder. These should be used as directed to avoid diluting the process. Finally, the carpet needs to be cleaned with a wet vac and cool water. Avoid steam cleaners as these can set the odor in the fibers. Sprinkle the area with baking soda to neutralize any lingering odors.
If the smell is pervasive, the surface may need to be re-treated several times. It is also possible that the odor has sunk into the base of the floor, in which case the carpet or linoleum needs to be replaced. If the cat odor has gone all the way to the concrete, clean the concrete thoroughly, then apply both a base and a primer before laying fresh carpet or linoleum.