In article ,
Amanda Riphnykhazova wrote:

You guys aren't impressed by 'the spray a bit of WD40 around the key'
solution before risking breaking the (admittedly non-working) key?

WD-40 is not a good product to use as a cleaning solvent for sensitive
equipment. It contains some materials (oils, basically) which tend to
become gummy after being exposed to air for a while. Although it may
flush crud out when you spray it on, the remaining oily residue will
tend to attract dust, crud, cat hair, panda dander, etc. forever
after, and it can very well cause long-term problem worse than the one
you tried to solve.

If you want to try a flush-out, there are much better products
available for use. Look around for an aerosol product which is
designed to use as a contact-and-electronics cleaner... a "zero
residue" type described as being safe for plastics and for electronic
components (precious-metal contacts, elastomers, and so forth). You
can spray these liberally into the keyboard (outside!), drain
thoroughly, gently blow some warm air (not hot) through it to blow
away the remaining solvent and any water condensation, and you'll be
unlikely to have left anything in the keyboard which will come back to
haunt you.

The stronger flushing solvents (e.g. flux remover) may be too
aggressive... some of them will attack certain plastics.
Electronics-grade isopropyl alcohol (*not* consumer-grade "rubbing
alcohol") is probably safe for most equipment.