You need an enzyme cleaner to break down the proteins in the urine. Tbh if a car has pissed on something be prepared for it to happen again as once their scent is there, they like to mark it regularly for comfort and reassurance. I would personally get rid of the cover and buy a new one.
Take the cover off and wash it as per instructions, hand wash only on inserts x
I second enzyme cleaner! It works magically
If it’s just in the seat, you can take the cover off and wash it. 🫶🏻 they’re easy to take on and off.