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Open the sunroof fully. Then look into the corners or the channels. The front drains are holes are in the corners. You will need a flashlight to see them. Other wise you will have to remove the sun visors, the plastic A pillars between the doors and the windshield, and the door weatherstrip on the body, and lower the headliner in the corners to get to the hose.
The back ones are also in the corners between the doors on each side.