how to remove hex screw stumps

How u remove the screw stumps left on the sheetmetal? When removing hex screws holding the underside plastic with sheetmetal or frame, they were rusted so badly the screws came off broken. The broken screw
heads are marked "6" it could be a "9" not sure. Its from Ford Escort LX 1.9L.
Appreciate any help.
Sam.
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What plastic are you talking about? The splash gaurd stuff?? If its an old pice of crap Ford, throw the stuff out, save your brain.

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