Had similar issue on my 2007. You need to use some plastic regeneration stuff or the trim re-generator stuff. It will generally get it out. You might be able to claim it under your insurances comprehensive??? Haven't tried to ask about that but maybe. I doubt BMW would cover it since it definitely isn't a manufacturer default like steering wheel peeling, etc.
I used black magic at least once a week on it and it was almost unnoticeable after a while.
My vert always has a noticeable very dry line in the plastic at the seal point. I use back to black also and it helps quite a bit. Mine has NEVER looked that bad! But I pretty much apply plastic lubricant at least every couple of weeks. Despite that it dries out pretty quickly. Good luck, did you have the top up for a very long time?
Try rubbing gently with a wet Mr. Clean eraser. These are one of my favourite tools for getting scuffs (especially shoe marks) out of the interior plastic trim. Go easy at first to see if it makes any marks. If okay, then go a little harder. Good Luck!
The BMW field engineer has ruled that the stain is from outside influence, so they wont cover it under warranty...
I've asked to speak to him directly about it. My theory is that the gaskets on the bottom of the convertible turn white over time (like most black rubber gaskets do) and transfer to the trunk lid.
Any other thoughts or suggestions is greatly appreciated. I will try the suggestions....
Very frustrating that I can detail the car to make it look awesome...except for this...
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