We always thought that a good deterrent for Rodents was anywhere from Micturating on your car wheels, Mothballs, Bitrex, Peppermint oil, most mints, then went to dogs hair, and other what would seem to be a deterrent like a snakeskin....
1 newspaper article says * can be lured into a bottle of brown sugar solution & baking soda, wrapped in black paper ( presumably to darken bottle). But CO² is invisible & odourless, a-f-a-i-k.