I'm no expert, but I guess I would look into ultrasonic cleaning
methods.

But no amount of ultrasonic or chemical cleaning will help you if critical,
non-replaceable components are destroyed. Particularly if the Emotion Engine
VLSI was zapped by a short caused by the cat ****.

It may be difficult, if not impossible, to dismount the VLSI from the board as
it is most likely wave-soldered with the mountings concealed. Even if you
could remove it and reinstall a new chip, Sony may not supply a replacement
VLSI to anyone.

If the VLSI core is shot, you have to replace the entire mainboard, which may
end up costing more to do than simply replacing the entire console for a new
one. This is assuming you have a resource for a replacement mainboard of the
type required, depending on the model number. - Reinhart