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From under the car, the rear drain outlets are inaccessible. They don't seem to clog though. The front outlets are accessed from under the bonnet (hood). First remove the plastic grilles on each side of the car, one over the brake reservoir and the other on the other side of the car. Look down deep into the wells underneath and you'll see a body colour short hose jutting out into the well (difficult to see under the brake reservoir). These hose stubs are closed at the end with a one way flap. Open the sunroof and carefully fill the channel under the wind deflector with water. Then reach into each well and squeeze the hose stubs with thumb & finger. Hopefully there will be a satisfying splurge of gunky matter that was clogging the drain and the water with pour through. Repeat on the other side. I do this two or three times a year - very satisfying. Also stops the "damp dog" smell upon first opening the sunroof after rain. Don't overfill the channel under the wind deflector for obvious reasons.
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