If the corrosion got under the cable insulation, you will need to remove an inch or two of the cable, and put on a new terminal.
Then grease up the new stuff.
edit: you probably do need to cut back the cable, the corroision in the wire slows down the electron flow. Good chance this is why you are cranking poorly.
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2017 GMC Sierra 1500 SLE
2020 Fusion Titanium
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