Don't forget the A/C dump underneath the car. A chunk of steel wool works quite well.
Set a few traps around the car and check your trap line every few days. Victor electric traps do a great job and a light flashes when you zap one with 6K volts
I use a rubber ball in the exhaust. Just remember to remove it in the Spring or you will be chasing it.
Follow the other advice here and hope for the best. Not a dryer sheet fan; had one step on a dryer sheet to get to a glue trap with a nice, tasty acorn in the middle.