I used to have grackles and starlings perch in the trees in my back yard and along the creek and at the neighbors. They have a collective memory and don't come over here any more. I have an old galvanized trash can and my method is simple but noisy - take the lid and and old golf club pole (the head is missing) and while holding the lid by the handle and walk close to the trees then break into a huge amount of banging on the lid. The birds do not like this. I might do it in the back then walk to the front and bang the lid near the across the street neighbors trees. Exit birds. They perch a couple of yards away or in the woods, but after a few evenings of lid-banging they just don't come into my range. And after a few years of lid bangings they don't come hang out in this neighborhood.

You have to be sneaky (get as close as you can) and bold and forceful when banging the lid, don't worry what the neighbors will think. If they ask what is that gawdawful racket, just tell them.