Rodent In Truck Headliner Area

I have a 2014 Tundra that has regularly had rodents in the cab. I live in New England and caught 21 mice in the cab with snap traps last winter. It’s another November and there is a large stain on the headliner starting at the box where the 2 ceiling lights are. I now hear nuts rolling around up above my head. Please don’t suggest I have my head examined. We have oak trees. Rural area. I believe it’s a chipmunk because I see a lot of them in the yard this year and on the wheels of the truck sometimes. Does anyone know how they are accessing the ceiling area ? And how difficult will it be to remove the acorns up there ? I am at a loss. Thanks guys !

 

Once mice get into the cab they can squeeze through the tightest of spaces. You will need to do the screen mod on the firewall to keep them out, that's the only way that completely works. As far as the nuts in the headliner, I would loosen the headliner to pull it down slightly then maybe you could use a long hose attachment on a vac to suck them out. Good luck.