Do you actually use washing liquid to wash the car? It's true that the ph is bad for the paintwork so probably not something you'd want to admit as part of a warranty claim. The trim around the rear windows on my 2008 XC70 have gone slightly cloudy but after nearly 10 years of exposure to the elements it's not surprising. You could try gently cleaning with a paint restorer and then put on several coats of quality UV protecting wax to keep it at bay.
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