When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Have lived with this on both D and P side windows on both my 997.1 2008 C2S and my 997.2 2012 C2GTS. My service guy says it is a lubricant for the window mechanism. Seems sloppy engineering in an otherwise supremely well engineered car but as others have said what the heck, clean the windows more often. I keep a small spray bottle of eyeglass cleaner and a microfiber cloth in my door storage box, which also works great for removing dried doggie nose prints (we have a pair of Toy Manchesters who love to ride in my 911!).
This seems to be a constant issue with the 997 models--coupes as well as cabriolets. And age is not a factor. When I first took delivery of the car it was a PITA but I adapted, yet now many years later it happens again periodically. Because of the cabriolet top I keep paint cleaner and windex along with two rags in the car at all times. (The canvas top should be tackled immediately if a bird targets your top or paint).
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.
This has happened to me. When I was working up in the Mojave desert with the high winds and blowing sands I must have collected a bit of sand in the inner window trim which acted like a mini-diamond cutter every time my window went up and down and has left a couple of vertical lines on the inner glass which can be felt with a fingernail. I don't think there is any fix for it other than replace the tint. I'll live with it for now.
It happens on my '09 cab. It's residue from some lube inside the door--probably off of the window regulator. My streak is fairly wide and happens to both doors.
If it's gotten into the window felt, it'll be a problem forever. I had chalked this up to a unique problem that only I had. Now that I know it's a common thing, I find it unacceptable for a car at this price point.
I have the same problem as well. Mainly on the passenger side. It forces me to roll the windows down while driving, but that is fine because of where I live. It's always nice.
It happens on my '09 cab. It's residue from some lube inside the door--probably off of the window regulator. My streak is fairly wide and happens to both doors.
If it's gotten into the window felt, it'll be a problem forever. I had chalked this up to a unique problem that only I had. Now that I know it's a common thing, I find it unacceptable for a car at this price point.
I agree. Mine does it bad enough where it affects visibility through the driver's side window. Maybe this is a warranty item. If it's not then I guess it's considered normal having to carry a rag to wipe down the inside of the windows every time they're rolled down.
Old thread. But wondering if anyone else that had this issue found a fix for it. I am seeing this a lot on my GTS. I am not worried much about the streak as much as I am worried about getting tints and if this might scratch the tints.
9 Vehicles Porsche Helped Engineer that Aren't Porsches
Slideshow: Long before engineering consulting became trendy, Porsche was quietly helping other automakers build everything from supercars to economy hatchbacks.
9 Features and Characteristics That Only Porsche People Understand
Slideshow: Some brands build cars. Porsche builds traditions, obsessions, and a few habits that stopped making sense decades ago but somehow became part of the charm.
This Builder Is Turning Heads With Its Slantnose 911 Creation
Slideshow: A small Polish tuner has reimagined the Porsche 911 Slantnose for the modern era, blending 1980s nostalgia with widebody tuning culture and serious performance upgrades.
Porsche 911 GT3 Artisan Edition Pays Homage to Japanese Culture
Slideshow: Porsche has created a Japan-only 911 GT3 Artisan Edition that blends track-ready hardware with design cues inspired by traditional Japanese craftsmanship.
Porsche Reveals Coupe Variant of the Electric Cayenne With a Fresh Look
Slideshow: Porsche's latest electric Cayenne Coupe blends dramatic styling with supercar acceleration, turning the brand's midsize SUV into a 1,139-horsepower flagship.