Curiously, Mr Sheen is the stuff I use for all the archaic hardware I come across, inside and out. Cases, panels, inside plastic bits and motherboards, they all get a Mr Sheening.
I started doing this when I came across a machine with a motherboard that had mice nesting on top of it, and corrosion from their peeing all over it. After a run through with dishwashing liquid and a huge rinse, thankfully with no tracks completely eaten through, I coated the whole thing with Mr Sheen and left it to dry completely. It's still working...
...as are the other 42 computers I've done that to.
A clean motherboard is a happy motherboard!