About 40+ years ago when I was in college and still at home, I had a small brown bat crawl under a window AC and was flying around my bedroom in the middle of the night. What a production. I left the bedroom, closed the door, and the next morning went on a hunt to find it. I finally found it asleep hanging upside down in some sheer curtains that I had at the window. It was wild how long it took to find the little dark brown thing clinging upside down asleep in the folds of sheer white curtains, but I did finally spot it. 
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If it is daytime, the critter is probably not going anywhere and is asleep but what I did was to get a large wicker laundry hamper (with a lid handy) and got a pencil and gradually started working it under its little toes as an alternate for it to grab onto and that finally woke it up and as it was flying around, I was able to get it to fly into the hamper, and then I promptly put the hamper up against the open window so it could exit. It took time but that finally got rid of it.
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