Squeaking Noise Coming From Back of The Cabin and/or The Trunk

[Qualiteli]

Hi all, I bought a fairly unused e89 a month ago and it started to make squeaking noises coming from somewhere near the backwindow and/or the trunk. I tried to lubricate every rubber I saw but that didn't help. Is there any solutions? The sound is becoming increasingly more disturbing and driving me crazy.

 

[flybobbie]

The triangle wedge that centres the glass, it rubs.
Try some thin black electrical tape over the wedge. Just one layer.