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https://forums.nicoclub.com/forecast-u7026.html
Sat May 10, 2003 11:06 am
the sunroof drains are long black hoses that run to the underside of the car. There are two at the front and i believe two at the back. those drains are to port away water that gets in even while the sunroof is closed.
The Inside Diameter (ID) of these hoses isn't real big and the surface isn't supper slippery. Both of which conspire to make the drain lines suseptible to pluging just like a downspout on your house. They get plugged from debris like tiny bits of leaves, dirt, or even green scum that will grow in there if it stays wet long enough.
Try a bit of low pressure compressed air to blow them out (anyone feel free to jump in here if this method isn't the best)
dan