At home all of our barns are pretty tight so they don't get inside much but when they do I go during the day and turn off all the lights then I remove the screen from a fan in the barn and turn the fan on, works great. With guns the quickest way to clean up is with a 12 guage and 71/2 but not too close to the tin. I've found the 22 bb shots to be pretty useless. A 1000 fps air rifle works well for shooting them off a roof peak and if you miss by chance the pellet won't penitrate if you're shooting parallel to the roof tin, it will skip off tumbling and quickly lose steam. At our place the 1 barn is right against a hill side so I actually go into the second floor of the adjacent barn and shoot them off the peak with a 22 LR, just make very sure to not hit the tin. I've gotta say the falconing sounds really neat too.