Wrap a rubber snake on it see it that helps. You want to move it occasionally so they don't get used to it not moving.Since they perch on mirrow only .
This actually works we use rubber snakes for birds and squirrels as a deterrent. My wife brought it too my attention she's orignally from Kentucky,
I said too myself this isn't going too work so I go out and try too buy some rubber snakes and couldn't find any so I ordered them on Ebay and sure as S**T it works.
The squirrels run around on the fence and make their crazy loud sound but they do not crawl on the screen anymore and the birds stay up in the trees.
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