How to sanitize interior after long-term rodent intrusion?

After a gallon of milk blew up and soaked into the carpet of my commute car the carpet could not be cleaned enough to keep the smell from coming back. Carpet had to be pulled and replaced but before installed I used an enzyme product made by OdoBan that worked well to neutralize the floor pan and various crevices that the milk seeped into.
I tried to use it again to kill the mice piss smell from my old barracuda that was stored in a barn... it didn't work as just a spray down of the carpet but it did work to kill it after the carpet was removed.