How to unscrew a blunt screw?

The screw suffered few metal-on-metal scrapping and blunted with little purchase left, it is surprising no one else asked of this, not the screwdriver but screw affixed on a netbook, it is at bottom-side and all other screws are fine and already out. I don't have industrial lubricant oil, the screw is clasping... show more The screw suffered few metal-on-metal scrapping and blunted with little purchase left, it is surprising no one else asked of this, not the screwdriver but screw affixed on a netbook, it is at bottom-side and all other screws are fine and already out.

I don't have industrial lubricant oil, the screw is clasping bottom plastic to top keyboard, with electronics sandwiched in between. Need to do so to put in hard drive.
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