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This is one of those things where all I would do is say something like "I can try some stuff, and it might help, but nothing will make that disappear - short of a full, cleaning/brightening, sanding and refinish of all of it." You just can't smoothly replicate that many years of differential exposure especially with - as @fauxlynn said - those straight lines. A lot of the discoloration does just look like dirt to me. Years of no air circulation and exposure to whatever dusting of the ceiling may have been done. But even if that gets cleaned off it's still years and years of differential exposure.

I'd also agree with @Redux that it looks a lot like WRC. By itself that doesn't change the underlying issue though. But it might change what you try.
 
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