Bmw Clear Bra Bmw 316i Compact Leaking Clear Greasy Fluid Slightly...??

Bmw 316i compact leaking clear greasy fluid slightly...?? - bmw clear bra

Hello
I have an n reg BMW 316i compact, I noticed that sometimes the car is parked (parking) is filtered fluid.its a small amount of light directly next to the center of the cabin of the car and walk - Below is a clear liquid no odor, but it feels so no water can be greasy.
only a small amount of the size of an open hand and comes only once in a while not all the time ..
Could it be something to do with the clutch or put on so in the prking?
Thanks to everyone who can help ..