In my experience a good enzyme cleaner is essential when you need to remove cat urine. Enzyme cleaners break down the chemical nature of the cat urine, they don’t just cover up the odor like some cleaners, they actually remove cat urine.
But they’re not only good as a cat urine remover, they also work really well on a number of other pet-related stains, like those that come with the infamous hairballs, and even non pet-related stains like a coffee stain on the carpet.