Using mothballs to get rid of bats is a technique that is often reported and discussed by people, and is actually reported as sometimes being effective.
This technique involves placing handfuls of mothballs inside several nylon stockings, and hanging the stockings in the bats’ resting and roosting spaces. However, it might not be clear, at least in some cases, as to whether it was the mothballs, the hanging nylon stockings, or a combination of both, that was helpful in getting rid of the bats.
This technique is generally not considered to be worthwhile as a legitimate means of getting rid of bats. There are other much more reliable techniques that no doubt would be more successful. And, be sure to keep in mind that even if you are successful in getting rid of your bats, you’ll have to seal up your building, completely, to prevent your bats from returning to their first choice of a roosting location, or other bats from moving into your building.