Sound machines for keeping birds away

Remove or cover where they roost. Chicken wire and wire mesh work well for it. I have found no independent reviews of these sonic machines saying they actually work. The only one I've ever seen work is a gas cannon, very loud and must be repeated often to keep birds away.

Screech owl sounds do work but are noisy and annoying to humans too check at lowes. Another good tactic is as simple as reflective foil ribbons hanging down from the celling to the rafters air moves the ribbons and scares / annoys the birds running them off.

Sound machines are the industry standard for wineries. They work really well according to the winery owners.

The company I work for has pigeon problem!!those little critters poop on everything!!!
We purchased 2 of those sound machines that specifically had a pigeon setting and the pigeons actually got worse.lol I think it actually called them in not repelled them like it should have.
Most of the time the pigeons are scratching around everywhere but as soon as I break out the air rifle they vanished into thin air.ill give them credit on being smarter than I thought they were.
From my experience the squawk boxes are a waste of money in my area.

Ooh the sound machines we have are about 300$ each and I wouldn't give a plug nickel for them, useless I say.

There called Airguns they make a small sound similar to a bang when aimed in the direction of these pest birds they do a great job of eliminating the problem.