Drainpipe from the panorama sunroof DIY E70

[Westlotorn]

Thanks to all above for the tips provided. My 2008 E70 X5 4.8L flooded twice recently.
Dchang0, your situation was similar to mine. Pass side almost completely plugged and the drivers side was partially plugged. Car was parked slightly down hill each time it flooded so the rear drains offered no help.

I did not have any Weed eater cord, I tried a small copper wire, no luck. I blew air using a small hose attached to my compressor knozzle, not sure if that helped.
I took a small water bottle, standard cheap water 12 oz bottle and mixed a strong mix of dawn dish soap and water in the bottle. I poured that into the channel where the drain is. It took about 1/4 bottle and backed up.
You need to be careful to get water only into the channel most under the body of the car.
There is another channel that houses the roof retractor track which you can also fill with water but it has no drain if you happen to fill it by mistake it will eventually drain into your roof, mine ended up in the Light fixture at the front of the sunroof.
I blew more air a couple times with soapy water down in the tube and junk started coming out on the floor behind each front tire and the flow picked up quite a bit.
I flowed 3 or 4 more bottles of soapy water down the drains while cleaning all the drain area around the sunroof opening. There was a lot of light dirt in that area that could over time get into the drain again.

One note. These cars have the pop up wind deflector in the very front of the sunroof opening. If you bump the wind deflector mechanism it will break. I broke both sides before learning what had happened. There is a very thin plasic support on the wind deflector about 6" back from the opening on each side. My 10 year old plastic was so brittle it broke into small pieces when I lifted a little on the deflector to get access for cleaning. My Mistake. They can be very brittle.

The rear drains come out of the E70 inside the rear lift gate opening. Open the gate and look about 6-8 " inside each side on the top, under where the lift gate will cover when closed. Both of mine were open but I did get a little dirt out of both. These I cleaned from the rear as I could not find access from the front. They feed from under the fixed glass in the rear of the sunroof. I ran my wire up through these on each side.
Leaks are fixed.