You can also remove the wiper cowl to access the rear plugs. It's not real hard to remove. Rove the wiper arms, then cowl grill. Once that's off you can access the bolts that hold the wiper tray in. Maybe six bolts? Unplug the wiper motor and washer fluid hose and the whole tray comes out. I know that sounds like alot of work , but really only takes a few minutes to do. It really opens up the area behind the motor.