Rodents in the Attic
To get rid of most critters in the attic, including rats, mice, squirrels, raccoons, etc., allow a way out for them and dust the attic with dry hot pepper. They won't hang around. Find the hole where they came in and seal it or they will be back. Another method is to remove a vent cover and install a spring loaded 1/4" piece of plexiglass. The animal is attracted to the light, goes out on the glass, falls through and can't get back in. Problem solved.