I can't quite tell if your lanai windows are thermopane (2 pieces of glass). Either way, as long as the glass isn't foggy, you can simply scrape and re-caulk the seams on the outside with clear silicon. The 3rd picture looks like a bit of rust (inside?) which is weird since the frame is likely aluminum or vinyl.
Keep describing age, type of windows, etc....more of a handyman job to "extend" the life
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