Proper traps.
Snap and done jobs, not those silly glue ones.
Peanut butter as bait.

Keep baiting until you get a week clear, then leave a few down as indicators in case you get more.

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That is what is under the hood of my wife mini now.

Two weeks ago; new wire loom $600 + $600 installation/testing + $250 of taxes. Luckily the insurance is picking the bill - $300 deductible.

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These throw-paks really work. Don't open them when placing them. The paper is scented to attract mice and rats.

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I have a car in storage and use unscented glue traps. The guy at the varmint store said to use unscented so as not to attract the mice. I put a few along the base of the walls and some near each tire/wheel. In the last few years I've only found a couple of caught mice and never any in the car or damage to the car.

Just use these

https://www.amazon.com/Pest-Stop-Systems-Little-Nipper-Mouse/dp/B005LV27PY

We get mice every winter. Briefly.

Why not hire an exterminator?

Go nuclear. Traps, poison, glue, cats, etc... Splurge on a few hundred bucks. Thats probably less than lost time diagnosing one wiring chew through...

I had mice appear in my garage last spring for the first time in 15 years. Found a dead one under my work bench at first. Then I set traps and caught at least 5-7 over the summer. Just caught 2 more this past week.

Also, I got my M3 going this past summer for the first time since 2013. In the process I discovered that they had gotten in to where the computer is housed on the car. Since this car has a V8 swap, this is a GM computer and it's held in there by non factory means. I found some high density foam squares 9" x 9" at the hardware store. It's basically wedged in there between several layers of these. The mice seem to like those, found bits of that stuff all chewed up. No apparent damage to any wires yet. For the life of me, I don't know how they got in there. That area and the harness leading to it are weather sealed. I'm terrified these little f**kers are going to destroy this car.

Have them get a cat or two and keep them hungry. BTW, had a groundhog chew through a braided fuel line on my brother's truck once. I parked myself about 50 yards from the truck one late afternoon and took care of the problem... then I fixed the fuel line.

While looking up what Bitrex is I found this.

Barrier™ with Bitrex Wound Care Spray
https://www.qcsupply.com/barrier-bitrex.html

The little animals just chewed on wires in my engine bay of the S-10 that I park in the driveway and park on the street.

Only about four small wires in a harness, truck still runs.

I discover this after the truck would not start, I pulled the broken wires so they would not short out, wiggled a few connections and it started right up.

I'm doing he repairs later this week, don't want to leave wires exposed all winter.

Bingo...tho I do give the pack a small knife slice before placing it. Mice like to feel concealed, so I place baits and traps behind a board leaned against a wall.

Mostly for pack rats, but during the expansion season, when the litters scatter, we have to leave the hoods open on all the cars and pickups. They won't nest in the engine compartment if the hoods open. Mice maybe? But it seems to work for both.

In Eastern Oregon you know when its expansion season and exactly who's getting plagued. Open hoods.-WW

ps. No, pack rats never leave anything cool when they steal/trade.

When I lived up north I surrounded the 911 with these when November came. One single ball every foot or two.


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Lots of mouse solutions offered here:

https://store.doyourownpestcontrol.com/

From the OP...

"They have cats, and said there are plenty of snakes around."

Three way attack. Poison, sticky traps and snap traps. I have apple trees in the yard. They attract mice every year. Everything is placed where pets can't get to it. The poison says "one bite" but it sure disappears. Snap traps work on mice heavy enough to set them off so that is why I use sticky traps for the smaller mice. Big mice can escape a sticky trap.

I never used poison because of the feral cats in the neibourhood but they are all gone this year so now all out buildings get several bait stations.

Ugh.....Hate them. Had them get under my motor home and chew thru several air lines. PITA to fix. I've since installed a string of LED lights under the motor home that are on constantly and haven't seen any signs of the bastards.

But are they keepin em hungry?

Honestly the mice have been really bad this year. We have them in the house and in my pole barn. War has begun and so far I feel like I'm winning with the combination of dcon and traps.
Mice are like Barry Sanders back in the day. You can't stop em.... you can only hope to contain em.

Some people think hedge apples will keep them away.

I thought that was for spiders and other insects?? I never tried putting one in the crawl space for mice and never tried it for insects either.