C.M.
I don't know what county you live in, but I'm in Santa Clara County. When I had a problem with rodents I called Vector Control which is a county agency. Search for them on the internet. For FREE they sent someone out who came over and did an inspection of the outside of my house. She was able to tell me where I needed to put up screening (or steel wool) to keep the critters out and lots of other good info. Her big point was that first I needed to seal up the areas where the rodents can enter the house, and then, if necessary I could try to trap them (in my case they were in the attic.) So far, the sealing up the critical areas solved the problem so I haven't had to trap any.
I'd start with that. I think other counties probably have similar services.