How to get rid of a huge bird family over our deck, with a small roof above it? It is like a barnyard...?

Question:Help! We waited 31 years to build a little deck and put a roof over it for rain. Guess who thinks it is their own personal big bird house? A family of black, yes black birds. Not a cardinal or a yellow finch or a chickadee, but large black birds. UGH.

They had babies and I could not get rid of them then. Now the babies are 1/2 grown and flying and they are ALL there. Mom, Dad, and babies, going potty 100x a day. ANY IDEAS out there that are for real? THANKS A BUNCH!!! :)

Answers:
Well, you could put a tarp around where they poop. Next year knock the nest out, with out the eggs/babies inside, and then, they should leave somewhere else, keep doing it if you must!