I didn't even bother to clean the window or get it wet, I just glued them to the outside of the glass (sliding doors) and they are there for a few months already. They look less obtrusive or garish than other window chains (just look like frosted glass) and hopefully deter birds from hitting the windows. I haven't seen a bird hit since I set them up. I ordered more as I have four sliding doors and a picture window that closes. I've attached a photo of the inside and one of the outside.
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