The entire surface must be coated to repel bats. Use a small hand sprayer with high pressure to coat the surface and repeat applications since dust can cause them to lose their tackiness. This is also used to prevent birds from roosting in unwanted areas. The top of the chimney is then tightly sealed off. Once the bats are dead, the packing, remaining cyanide and carcasses should be removed.
Bright lights can be effective in repelling bats.
Despite some claims, none of the ultrasonic sound devices have proven effective for repelling bats from buildings. Dead bats and droppings should be removed from the premises because of the odor from decaying bodies. Never handle bats with bare hands. Use gloves, shovels, pails or cans.