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Wow, talk about a necropost. Brad's mice would have had great-great-great-great-grandchildren by now.
But now that you mention it, we put a little "post-consumer" cat litter into the gravel of the driveway, and even around the foundation of the house, to keep them away.
Out of curiosity, how exactly do you get the tomcat pee? Does yours know how to pee in a bottle? Or do you just pick him up when he's going and run around the truck with him?
The F150 I'm working on spent years in a field. I stopped counting at thirty mice removed from it, and there were more. They got into the HVAC system through the rubber drain for the heater box and between the upper cowl panel and the sheet metal underneath. They got into the cab through the vents and also a hole they chewed in the transfer case shift boot. I taped the boot, replaced the drain with a plate with a small hole in it, and meshed over the HVAC intakes under the cowl. The muffler was full of chicken feed. I'm hoping the clutch isn't full of mice, too, but at this point I would not be surprised.
And now you know why my username is too many mice!
Actually, there is a way to do it, if you're REALLY inclined. There's a cat litter you can get from a veterinarian, it's some kind of impermeable pellets (probably just hard plastic). Clean out your litter box, fill it with that litter, wait 'til the cat does number one, and all the pee precipitates to the bottom of the box since it has nothing to soak into. This is seriously how cat owners can get urine samples for their vet, if the vet is unable to express any from the bladder.