I've been noticing lately that whenever I roll up my driver's side window, the inside of the glass comes up with vertical smears. Every time. It comes off relatively easily with some water and a cloth, but it's a real PIA. It seems like it's gotten a bit worse recently. It's gotten to the point where I don't want to roll my window down anymore.

Does anyone know what this is and/or how to keep it from happening? Do you think I'll have to get the door taken apart to get at the source of the problem?
The passenger side window seems fine.

 

I have the same issue, but only occassionally. The gunk is near the front of the window on mine. *tracking thread*

 

Mine does it on both sides. I remember reading that it is fairly common in 911s. Mine is a cab, by the way. Would love to figure out a way to get this to stop

 

I get the a film on the bottom 3/4" from the windows doing their up and down movement when you open and close the doors against the weatherstripping. The filmy gunk is annoying.

 

Check via the search function here and at that 'other' place as well.
There was a post some time ago (6+ months I think) with exactly the same issue.
It may have had something to with the inner seal for the window being improperly positioned.
Sorry I do not remember the fix.
Hope you get it resolved.

 

I had the issue on my 09 and have it on my GTS as well. I believe there is a felt pad that contacts the window surface. The stuff comes off fairly easy but I sometimes worry about it scratching the tint film.

 

I get the streaks on both the driver and passenger windows on my 2010 C2S after I wash it or after it rains. BTW, the streaks are on the INSIDE of the windows. It drives me nuts!

I am going to attempt a "search" to see if I can find the fix that RennlistTomE mentioned in post #5. If I find the fix, I'll report back here.

 

I have an 07" C2 and mine does the same thing!

 

So glad someone posted this because my car does it on both sides and it is driving me nuts. I was even going to mention it to the dealer when I take it for service. I will be checking here for a solution.

Ken

 

I just consider this part of the beauty of Porsche ownership!! The wail of the flat 6, the wide hips, and the window gunk....

I've had it on my 03 turbo, my 09 cayman and now my 07 S.

 

I had it on my 04 GT3 the 07 RS and my 09 C4S but NOT on the 2010 RS. Seems to be a very common thing and the dealer says there is no real fix.

 

Let me just say I'm in total agreement with your fix.

 

05C2 with the same problem on both driver and passenger side. Still waiting for a solution.

 

I've got the same issue on my early build 2005 997S. Sounds like a common trait.

Zuffenhausen never bothered to find a remedy. I wonder if the 997.2 and 991 models have the same problem.

 

Same here. It gets worse when you treat the rubber trim pieces.

That said, you can win the battle by more window cleaning. Of course your cleaing the windows inside and out.

The gunk inside is a finite gremlin. Steady on.