On Thursday, November 3, 2016 at 5:43:22 PM UTC-8, Ben Coleman wrote:
Our club is discussing what we can do to deter birds from perching in our hangar and messing up our aircraft. Can anyone recommend a technique? Are there any methods which have not worked?

The birds are small, probably swallows.

Thanks Ben

You might try keeping a light on in the hangar.
I put a LED floog light in the hangar and left it on 27/7 and the birds have not returned.
bob