Hi
When I had my 2018 PHEV I also experienced Squirrel problem in that a couple of them started building a nest under the hood.
Only that I got rid of them was to buy some apples, place the in thd fridge and every few days cut a couple into quarters and poke some pellets of Rat Poison into the pieces and lay them near the nests.after a month or so, in the fall I saw no signs of the squirrels.
To try to prevent anymore going into my hood area, I cut up some chicken wire and placed the pieces in area to prevent anymore invasion.
As a safe guard, i did lay rat poison pellets whereever there were valleys under tge hood area.
I did trade in the 2018 for a 2022 in Sep 2022, but never had any visits from squirrels.
Then in Apr 2024 I received current 2024 and am happy to report that I have yet to see any sighs of squirrels.
I did notice fewer brown squirrels in my area as a few bigger Grey's have moved into the streets across tge street.
I will keep monitoring as I check the hood area every 1 month or so.
Good luck with your Car Invaders