Cleaning
Cars with a sliding roof have a system of pipes that drain water from the gap in the roof. Clogged pipes are best pierced with an old flexible speedometer drive cable. When using a drilling machine with an adjustable rotation speed, it is necessary to fix one end of the cable in the chuck of the machine and insert the other end into the hole to be pierced and drill out the blockages of the pipes at low speeds. With the help of a second person, this operation can be performed using a hand drill
The pipes that drain water forward run along the front pillars and exit near the lower hinges of the front door. These pipes must be cleaned from the side of the roof gap. The rear pipes run from the roof gap through the rear pillars and end at the bottom in the rear wheel wells. These pipes are pierced at the end at the bottom of the car.

The information is posted on this resource (VWmanual.ru)

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