I can understand your desperation. I hear the "coo-coo-cooing" through the bathroom vent first thing in the morning. It's enough to make me violent. Not a great way to start the day.
How irritating is the noise from the Bird Chase Supersonic?
Actually, it doesn't matter- at least it
It rates the Bird Pressure as light to medium. Is that the amount of pressure that the BCS puts on the birds???
I read that WD-40 works. Evidently they don't like the smell which is bizarre to me, I love it!
Let me know if you find a solution or if that BCS works out for you.