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Black streaks on Rear After rain

405 Views 7 Replies 4 Participants Last post by  MartsCT200
Aloha Y’all. Always getting black line streaks after the rain but the only place is down the rear, what do you think is the cause? (Recently washed car so this isn’t all that bad yet)

Also noticed on the inside top, the middle hole is missing the black plastic piece covering the hole is that supposed to be the case? What is that piece called?

Thanks everyone!🙏🙏

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Interesting. My 2016 with 30k miles has the same exact hole situation, even with the same dirt lol. I wonder if that's some sort of drain hole.

View attachment 62433

And the black spots of dirt on the back are because you drove in the rain. Just doing it once will make it look like that (doesn't matter if you washed it). Mudflaps won't help, because it's the way the air comes over the back of the car.
It's a drain hole. When I got my car back from the body shop, I asked about the same thing. I thought something was missing.
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