In trying to get rid of bats, you might try hanging strings of empty pop cans, plastic bottles, balloons, mylar balloons, strips of aluminum foil, etc, together in the bats’ roosting spaces. You’ll want to hang these objects in such a way as to allow them to move with a breeze or light wind.
The object of this technique is to make the bats’ resting and roosting spaces less than comfortable or accommodating for the bats, causing them to simply choose other living areas, and to move out of your building. Especially the movements and “clinking together” sounds of these objects might disrupt the bats enough to get rid of your bats.
If your bats‘ roosting spaces are relatively small, more like a small crawl space in an attic, rather than a large space, like a large storage shed or a barn, this intervention might be worth trying. It is certainly a simple, and “low-tech” possible technique to get rid of bats. The cans, bottles, balloons, strips of foil, etc, will have to be hung close enough together to prevent the bats from easily flying around in the space.
If the space where your bats have taken up residence is large, like a barn, this technique will likely not be at all effective, because bats are very accomplished flyers and navigators, well able to fly in and around multiple obstacles, as long as they have enough room to maneuver.