I've read about sailors putting shiny stuff to keep the birds off their sailboats. Crinkled aluminum and CDs seem to do the job. And our local transit authority has put up spikes and chicken wire to keep the birds out. But they find a way in anyway. Best bet: Keep a kittycat or peregrine falcon chained to your balcony. One or both'll keep them pigeons away.

HA HA HA what a bummer
There are lots of ways some may be more effective than others.

First try a plastic owl or hawk. Don't ask me if these gadgets work: I haven't a clue. But if they do, it's the cheapest and easiest solution.


You can epoxy sharp projections from the sill spaced closely enough that the pigeons find it uncomfortable and go elsewhere to shit. Use that epoxy that comes in a tube that you mold like play dough. They sell it in hardware and auto parts stores every where. Billy Mays ( that shouting idiot with the shoe polish in his beard and hair) sells the same stuff for six times the retail cost on TV calling it super putty or some such crap. .

Or you can go to any farm supply and get yourself a plug in electric charger and some of that aluminum wire and jerry rig some way to get the wire to clip into plastic stand offs around the sill area shocking the little fuckers off so they don't come back. You will need to run a dual wire system with ground wires and how wires strung right next to each other so that the birds can't touch one without also touching the other.

Because pigeons are insulated with lots of dusty dry feathers I rather suspect you'll have to get the heavier duty charger to get through the feathers. On the flip side if they are going to be touching the wires with their feet you will want the cheaper weaker charger cause the feet aren't insulated.
It really depends on how and where you run your wires.

I'd get a plastic cutting board cut two pieces to size of the sill. Make one about 3/4" shorter (in length) l than the other the longer one will be under the shorter one when assembled.
Drill two holes in the longer piece at the ends where it sticks out longer than the shorter piece. These holes are how you'll screw it to the sill.
Taking the shorter piece of plastic cut little notches in the ends that will trap my wires.
Wrap the wires around and connect them later. every other wire goes top the charger and the ones in the middle to a water or heating pipe ( if you have plastic pipes use to the ground wire in any electrical outlet.
Taking that other piece of plastic fasten it to the underside of the plastic with the wires wrapped on it. (to insulate the wires from the building .Screw the plastic pieces together without touching the wires with the screws.

Turn it on and watch.

I'd go get a pellet gun.

These work:

www.deterapigeon.com/
www.birdspikesonline.co.uk/Bird...pikes

You don't need electricity, a permit, a pellet gun, or even spare time to watch the fuckers. Just put the strips up and they don't land there anymore.

You can even hook 'em to a removable strip, so you can take 'em down when you have company.

I used to work on a horse ranch and the campesinos would put "Bird Tanglefoot" on the top railings around the feed troughs. pigeons could check in, but not back out. The campesinos would come by, twist their little necks, clip them off with a pair of dikes, and BBQ them. very tasty little grain fed buggers... And it was legal here in Southern California because they were a "pest species".

the simpliest and cheapest thing you could try is to hang a paper bag upside down with some string from the roof of the balcony. a guy around here said the crinkly noice bothers the birds so they don't nest or hang around. :) but I believe you'd need some kind of breeze to get the effect. perhaps a small fan outside?