All bird pest problems are really miscommunications--we've created a perfect opportunity for a bird, but we didn't get the message until the bird shows up. We built it (or planted it), and they came. To really fix the problem we have to take away the invitation. Figure out what the bird wants, how you've created the perfect opportunity for it, and then pull back that invitation by changing the configuration of whatever it is that the bird wants. Anything else is going to take a lot more effort over time, and result in continued miscommunications with the birds that are just showing up because no matter what else we do, we're still giving them an open invitation to come and get whatever it is that they want in order to satisfy their need.