But you could just break all the plastic rivets on the bottom side of the keyboard plate. That will let you disassemble the keyboard and you can get down to the membrane. From there you can clean up the goop/spillage that has gotten inside.

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Exactly what I did.

I actually cut the head of the rivets at an angle in hope they would snap back on that way. And they did.

The membrane had spillage remnants that I cleaned. Reassembled the whole thing and now it woks great.

So I'm happy to report that I'm now the owner of a fully functional PowerBook 165.