Drivers door noise

Gentlemen,

I have a fluttering sound that seems to be coming from the inside of my door with the window up.It seems to disappear with the window down.It starts at 30kph and increases in frequency and volume to 60 kph and then disappears at higher speeds until I slow down again.I am also getting a thin greasy smear on the upper left corner of that window as well.(related?)
The car is a 1995 s500 coupe ,82000 k

dislodged sound shielding??
wheel bearing??

I would appreciate any thoughts on this one.

Thanks Brad