I installed this on a window in my garage so people can't see in but I can still get some light. Fell off after about two days. I think the sun shining on it from the west was a factor. I decided to try the residue on the bedroom window which is always in the shade, it took about two months or so but also fell off. I washed both windows thoroughly, using a very large amount of water as directed in the instructions. I wanted it to work, but in my opinion it's useless.
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