I'm a automotive service advisor (20 years and counting) and have seen countless vehicles damaged by rodents. Usually it's chewed wiring in the engine bay or nests in the blower motor. I've seen darn near everything tried in attempting to repel the critters. Moth balls, peppermint, you name it. So far nothing has proven effective. Matter of fact, I've given several of the "repellants" a try in my own LUV and still the rodents still chew away. I did manage to cure a packrat issue in my other vehicle...with a pellet rifle.
On a side note, I'd never recommend putting rat poison anywhere in a vehicle. The dust and fumes are extremely toxic. Even when placed in the engine bay, badness can get into the cabin via the vent ducting and ruin your day.
_________________ Tom '81 Luv diesel 4X4 - daily driver
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