Originally Posted by Aggiesrok
Go to Petsmart and get urine cleaner. They have some that have an enzyme that eliminates the order from a biological point. I think they work pretty well.
What's suggested above and an ozone generator will probably work best, but if it has soaked into the seats, underlying foam and carpets very much you may never get it out, short of replacing all the seats and carpets.
A rental place or cleaning company may have an ozone generator you could rent.