BMW Questions? Ask a BMW Repair Expert for Answers.
hey my name is***** will try to assist you
1- you have the windshield washer pump
2- the washer pump grommet goes bad also that could leak
3- the fluid level sensor : will have a electric connector on it not a hose.
4- the bottle itself might have a tiny crack in it
as far as the that nibble that looks a cover or a hose gets attached to it , if it is what u see in the diagram i sent you , then that should be the water feed line that should be connected to the washer pump and from there it goes the washer system.
you can send me a picture if you like of what you seeing so i can confirm for you .