Rodent poison will kill them but they are already in the vehicle.The best rodent poison that you can buy is Contrac. You can find it online. I get the small packets and spread them out in our crawl space and the garage. You can also get the big blocks and put them in the black plastic external cases that you see around strip malls (like a shoebox). Why I like the packets is you can see when the mice/rats tear into them. Then just replace the packets (after you clean up the torn one). Its a great way to see if you have a varmint issue. And the other good part is I never see the bodies. They may be dead in the walls or wherever they were nesting, but I never see carcasses.
I use Moth Balls. Put one in the cabin and one in the engine compartment.
I farmed for 35 years and it did keep the mice out.
I did have a squirrel chew up some wires on my plow truck diesel.
Transmission wires and insulation. It was after the salt.
Keep the salt off too!
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