[Lynn]

Multi level plan of attack.
Poison on the perimeter of the building.
Traps around the car.
Block off any point of entry into any part of the vehicles if possible; i.e. remove air cleaner, and place a cap on the carb, block off fresh air intakes when possible, etc.
Poison packets in the car, on the floor, under the hood, etc.

My personal experience with dryer sheets: When I had my Studebaker farm truck out side in a rural area (thank goodness it is indoors now) I placed dryer sheets on the floor and the seat. Noticed some were gone. Took the seat out, and there was a nest made partially from dryer sheets. I have heard others say they worked; maybe I had the wrong brand.