If urine got inside the lens, the first thing I would do is put it in a bucket of fresh water, just like you would if you'd dropped it in the sea. You want to minimize the damage urine/salt water can do to the insides of the lens. Rinse it out really really good, change the water often. Then take it to a repairman. (Disclaimer: This is pure speculation as I have never done this.)

If urine did NOT get inside the lens, wipe it down with a damp towel or somesuch. I hate febreeze, and I can't stand the smell of some of the gear I get through ebay.

(Note to self: Don't buy 400mm lenses through ebay for a few years.)