u/Budget_Bet_5385

I have a 2016 Toyota Camry and I had to remove the battery to change out the headlamp. One of my terminal connectors disintegrated and left me stuck with this.

How do I remove the bolt so that I can replace the old connector with a new one? I have used a wire brush to scrape off as much corrosion as possible. I've also used corrosion spray. But the last green bit won't budge.