I have the same issue in the same area on my rear window. It's where it folds when putting the top up and down. The material is breaking down due to age, use and possibly uv damage combined. I've been somewhat successful using novus plastic polish products to make it go away enough to take the sting out of it. Eventually it will come back though. Now what I can't remember is if it's on the inside or outside. I'd be open to try anything else that someone has had better luck with. I have 303 products for boat care and yes, they are good.
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