Urine Smell in the vents

[Shugalou]

Hey guys,

While doing my rad flush I had to crank the heat for 10 minutes. Good news is that the heat worked (could be better but it worked).

Bad news is a strong urine odor. I know something lived under hood as I found a pile of acorns under battery tray and various locations.

My question is
What is the best plan of attack, I'm planning on pulling the glove box and looking around in there and also the heater on the firewall and checking in there and cleaning with bleach.

Has anyone been down this road before? If so any tips.

I won't even mention this one to my wife for fear she would never step foot in the truck

Thanks