Another technique that some people have at least attempted in their efforts to get rid of their bats, is to put bad smelling foods or substances in the roosting spaces of the bats. Some of these bad smelling foods and substances include garlic, cloves, and even animal feces, including the feces of bat predators.
It is important to remember that bats generally like roosting in areas that humans would consider to be dark, damp, dank, and smelly. Bats can live in perfectly happily in closed off areas, like caves, with pounds, or even many tons of bat guano and urine in them, environments that humans would find to be seriously unpleasant and unhealthy.
The reports from people who use the “bad smells” technique to get rid of their bats are consistently unsuccessful, which is no surprise. Bats are much different than people in the environments that they like to live in, and in what they consider to be “smelly.”
This being the case, there is no reason to bother trying to get rid of your bats by using garlic, cloves, animal feces, or other substances that humans would consider to be “smelly.” These will only make the bat roosting area more unpleasant and unhealthy for humans, and could actually encourage the bats to live there.
This web site discusses and describes several more simple, humanitarian, and most importantly, effective methods to get rid of your bats.