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Good luck.
I read the other thread you talk about and personally don't have anything stuck on the nav screen (yet..) but I also read on another forum a guy even had fountain pen ink marks from a previous owner that wouldn't come off. Eventually he got the advice to use alcohol & it worked..
The coating on the panels is delicate to mechanical pressure/aggressive cleaning but the right tool/substance for the right job is the best option.
Even Micro fiber cloth should not be used like scotch-brite on an old rice pot ;-)
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