Sorry to hear you are having such a problem!
I can't really give any advice; I have barn swallows and king birds who like to nest in the barn, and I don't really mind, though the swallows, in large numbers, are REALLY messy(while the kingbird parents carry off the babies' poops, the swallow babies quickly learn to turn around, hang their little bird butts over the nest edge, and 'let 'er drop'...UGH!)--and, having a lot of them becomes VERY noisy! I began trying to limit their reproduction several years back by letting them raise one nest of babies, then either removing nests relentlessly, or by removing eggs from nests--both of which require me to move a step ladder all around and climb up and down, up and down...lots of work, but it did help - it got to where there were 10-15 pairs(or more?!) nesting in my barn, and if each raises a couple of nestsful of babies, that's a LOT of birds to have come back next year and raise even MORE!
My efforts have paid off, though...this year, so far, the 'returnees' arrived VERY late, according to what usually occurs, and there seem to only be about 8 of them...I SO hope that is all that will come; 3 or 4 pairs would be MUCH easier to have around than 10 t0 20 pairs!!
The REAL bird 'pests' around here are the ravens...I need to buy a new pellet gun, to 'discourage' them from stealing the babies of all of the other native birds, along with the baby rabbits, along with shi**ing into my horse feeders and waters as they arrogantly perch there! I actually found a CAT's lower leg lying on the ground below my utility pole yesterday...ONLY a raven could have dropped it there...they are VERY smart, but wicked.
Margo
PS--Places like Farmtek have strips of 'no-perch' material to battle the birds, but it is pretty expensive. I tried the fake owl thing once; the birds ignored it COMPLETELY; it might as well have been invisible!