Black streaks

[Mansderm161]

Anyone else get this? I have black streaks after every rain...3 years now. Airstream thought they fixed it...trimmed the black seal back and coated it, but it's back....both sides.

[Rig Rat]

I believe it's coming from dirt/dust buildup on the black matte coating between the crank out windows and the frame. I've minimized the streaking by opening the windows up and wiping the coated area clean. I've also noticed streaks coming down from my roof too. I'll need to get up there and scrub it clean once we get to warmer weather here in the next month.

[Osteomeatl]

Have had that happen after a few rainstorms every since I took delivery of my 2018. I just assumed it was the rubber around the windows dissolving and running down the side of the van. Somewhat unnerving if that’s the case and based on the consistency I have no reason to suspect otherwise. Will be interesting to see what’s left to seal the windows in 10 years.

[Luckysnuck]

Have also experienced this issue since day one of ownership of my brand new rig in August 2018. Cleans off easily so I have not sweat it...although if a remedy is out there I'm all ears!