1. remove the wipers. ( sometimes you can remove the 15mm nuts and just rock the arms up and down, some require a battery terminal puller )
mark the wiper position on the windshield before removing,
2. remove the cowl screws.
3. undo the O2 sensor wire clips attached to the bottom of the plastic cowl.
4. cut the wire tires.
leave the washer lines and wires connected and place out of the way.\you can now clean up the mess, there are 3 drain lines.