Its because of the chemicals that they put in the liquid for washing the rear window...mine were the same, i used sandpaper p1500 and p2000 with water, around 5-8 min each, and after that with polish paste until i liked the result...
My inner rears are going dull as well. I don't use any strange chemicals and don't even park in sunlight. It must be the cheap plastic used by the manufacturer - Hella. No doubt it would polish out
Mines the same, i wet sanded them back and re laquered them , fine for a month or so now the same, they advise wet snading polishing and theb make sure you wax them after , the lobger you keep waxxing them the longer theyll be fine
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