We only experienced this problem once and it was due to crud build up like you described and a driving sideways rain. After that I keep the slots clean and we installed the vinyl gutters above the windows and partway down the sides. No more problems. This is on the slider windows and the problem was on the 19. Never had a problem on the 21. Channels were clear and installed the gutters early on and finally have been lucky enough to stay out of an extended driving rain. I do not like the sound of hail though, no matter where I am unless it’s in a pavilion with a metal roof that I don’t own.
Iowa Dave
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Ain’t no trouble jacking a double Burma Shave
Dave
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