Are there small oval slots in the bottom edge of the window frame? If so those can fill up with wind blown dirt and debris and fail to drain water away. They ran be cleaned or routed out with a pipe cleaner or similar device and then hit with some compressed air to get the tiny stuff. After a regular cleaning and inspection on all framed windows is appropriate. In addition stick on gutters over the windows can channel away a lot of the water impacting the bottom of the window frame.
Hope this helps
Iowa Dave
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Ain’t no trouble jacking a double Burma Shave
Dave
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