is there anything one can spray ,under the eve's of a building to stop bats from gathering under eve's

16 gauge # 9 shot????

NO but Wildlife Control Supplies sells slick paint to make them to slippery to hold on to

Put up a string of LED Christmas lights (white) under the eve on a timer so they go on at dark and off at morning light. Bats do not like light.

^^^^ this ^^^^

I have a covered deck on the west side of my house. For year bats would stay in the corner near the ceiling of the roof that covered the deck. They make a heck of mess crapping all over the deck. I finally got an LED work light and aimed it towards where they were congregating and set it on a timer. It worked. No more bat crap.

Exclusion or harassment is the answer.

Pet weasel

thanks guys,

i picked 26 the first day and 11 the next, will bats go back to the same location ,like pigeon?

What do you mean by "picked"?

Yes, bats have a very strong homing instinct. And a very long lifespan for a small animal.

i use grippers to pick them off the walls,

they all fly away good when set free, never had one die,