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Old November 19th 19, 05:56 PM posted to rec.aviation.soaring
Duster[_2_]
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Default No more insects or rain droplets on glider wings?

Good for only 500 flushes though it says. However, NASA has been working on a bug-shedding coating, According to this article. Not sure what became of it.
https://www.nasa.gov/press-release/n...ough-bug-guts/