Any key fob experts here? Can I save this water damaged fob?

If you're concerned of a repeat, get some dielectric grease and coat the whole new board with it. LOL.
And skinny dip when near a pool next time. :LOL:

More seriously, the transistors or traces might be contaminated and more "aggressive" cleaning is needed. Meaning a spray alone may not jar loose ions, you might need to rub the board with copious amounts of liquid or use an ultrasonic cleaner.

Someone describes how one works....
https://blog.kurttomlinson.com/posts/how-to-fix-a-car-key-fob
 
I didn't see any mention of installing a new battery to see if it still works after the clean up. 🤷‍♂️

With such bad luck with the Rogue, your fortunes may take a turn for the better. I mean, it can't get much worse.
 
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