funny this was just brought up. after years of forgetting to run weed trimmer cord up through the back ones, I tried and could only get about 4" inside the rubber exit, under lift gate before the trimmer cord would snag and not go any further.
I will have to attempt to enter from the other end of the drainage tube.

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S