Update: Continuing window hardware clean-up: general meticulous Dremel brushing and overnight white vinegar bath (photo #1), 24 hour setting with Naval Jelly (photo #2), and brushing with orange fiber attachment on electric drill (photo #3). Naval Jelly instructions suggest washing off after ten minutes which I don't follow when I find decades of rust and pitting. Obviously water drains down the outside of the window onto the mechanism inside the doors.
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