How do you stop mice from entering your Honda Civic?

One of the ways mice get into Honda Civics (and other cars) is around the firewall between the engine and passenger compartment. Check to make sure all the rubber grommets around wiring are in place and secure. Check also for missing grommets. Mice can squeeze through a hole as small as nickel, believe it or not. They will initially search for warm areas which usually means the engine compartment. Once there, they will seek additional areas of comfort.