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For my 135i I sometimes use the Realoem site, that has diagrams and part numbers of everything. Find your car, navigate through the myriad advertisements, and eventually dive into the section that might contain what you are looking for. It would show you the shapes of parts, how they attach, and so on. If you look there for the A/C setup, HVAC system perhaps, whatever - it may show the drain line itself as an item that can be bought. Then you might get an idea of where it attaches, what shape it is, and where it might eventually drain out. With that info there's a chance you could figure out how to clear it?
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