I noticed while using the 1/2 screen on top of my dbl hung windows that the bugs can crawl up between the screen and window from the center. It's a 1/2 " gap or so and this looks like the solution. Clean the adhesion point with alcohol for better result. I could buy a full screen but this is cheaper. Stuck this to the back/top of the pull down glass window and the bristles touch the screen.
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