Unfortunately Facebook does not provide a way to "unfollow" all "Followers" at one time, however Facebook has recently provided a way to do them all in one place without needing to go individually to each Timeline Account...to view all "followers" in one place please click on the "v" at the end of the blue bar at the top of your Timeline Account, click on "News Feed Preferences" , click "PEOPLE" & there they are all in one place, to see them in alphabetical order click "alphabetical" at the top of your list.
Now Click on the 2nd option.