My experience with WD-40.
This goes back some 40 yrs...when I worked on electro-mechanical NCRs.
A salesman came in to demo WD-40...he sprayed the contacts of an open
relay that was connected to a light bulb.(110V)
He dropped the relay in clear container and began switching it on an
off. We were awed by the "water-proofing" effects of this "magical"
demonstration.
We bought a mess of this stuff and after a week we found it gummed-up
keys (or more precisely, their detent) to where they wouldn't retain.
Meaning, disassembly...cleaning...and re-lube with typewriter oil.

FWIW