I was tired of birds using part of the overhang on a part of my roof for a nest. Friend recommended that I try this and it worked. The Birds did not like the sticky substance on their feet, and went elsewhere.

http://birdbgone.com/products/bird-deterrents/transparent-bird-gel/transparent-bird-gel.html

If that does not work, they have a number of different products on their site.

http://birdbgone.com/

Joe