Birds roosting in the eaves of houses cause many problems. Their droppings are messy, the birds may damage property, the nests are often unsightly and birds may carry diseases that can be passed to humans. Getting rid of the birds is a matter of removing their basic needs: shelter, food, water and safety. When you have made the eaves of your house an unsuitable nesting place, the birds will seek a different, more appropriate home.
Play sonic deterrents such as the bird's warning call followed by a predator's cry or other loud or frightening sounds. Iowa State Extension recommends playing the sounds for ten to fifteen seconds of every minute just as the first birds are nesting for the evening, and then continue until dark. Repeat this procedure nightly until the birds move. Installing a sonic repellent triggered by a motion sensor will keep the birds from becoming acclimated to a sound.