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Apologies for separate reply but catching up with the thread after a few days. Can't remember how the hoods fold on 911's but on Chimeras and Griffs we used to recommend keeping a towel handy for the plastic rear screen. When you'd fold the roof down the plastic would get a severe kink and could get that haze on them but by padding it out with a towel you could prevent it from marking as badly.
I also remember a company advertising in the back of Classic&Sportscar who sold a solution for polishing these marks out.
Some of this happened today:
And we did indeed manage to remove some of the milky line - indications were good that we could remove all of it if we kept going, however the screen started to suffer from fog "bloom", so we stopped.
The larger issue is that the milky line will come back due to the way the screen folds:
Which means that it's always going to be a battle to keep it from doing this:
I spent the two hour drive home considering the situation and I think I'll book the car in to have the hood-with-glass put on, it is smaller but you tend to look "below the fold" when checking the rear view, and ultimately a slightly smaller field of vision that is crystal clear beats a larger field of vision that is cloudy to opaque.