You really can't get rid of them unless you completely seal it up and only open the door for entry/exit etc.
You may try lighting it up at night- with flood lights or fluorescents. The ultra sonic repellants, pee spray and moth balls don't work. And killing them won't help either (kill one and scare the rest until the next day and so on). You can get bat houses to try to tranfer them or.... car covers?
Shi
tty kaka.
