Try placing some Fresh Cab packets. They sell them at most hardware stores or through the Mfg at Earthkind.com
I have been able to get rid of them at our farmhouse, even when we bushhog, by using a combination of peppermint & cinnamon oil. I purchased a spray off Amazon but have seen it at Ace Hardware. It can be sprayed or saturate cotton balls. Place around and make sure to re-apply as the scent fades. They don’t like the smell. I’ve been told it can be toxic to pets.
Use classic snap traps. They are the most humane way to kill them because it works instantly
We use gain dryer sheets to keep bugs and rodents out of our RV.