If it's rusted it's been leaking for to long to potentially save anything
I used to leave my old PC, Galvatron, with the back right next to an open window, even in winter. Needless to say when, months later, I had a look back there...well things were pretty rusted lol. The pc still worked tho
The moral of the story, children, is that rust can indeed save your pc. If only so it can live out the rest of its life as the hardware equivilent of a quadrupal amputee...sigh. poor Galvatron never did overclock as well after that.