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On my 2016 CLA250 the black trim piece on the roof between the windshield and the panoramic roof has corroded. The car is kept in a carport out of direct sunlight. in Florida, so there is no exposure to road salt. There is no other paint or trim degradation on the car. Very disappointed to see this on my excellent German engineered automobile. Anyone else have this happen? Any suggestions?
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As suggested by someone on this thread, I think it's the combination of both the hot sunshine and the windshield fluid drying out on the panel.

That's why I always make sure I wax that panel everytime I wax my CLA.

Although you keep your vehicle under the porch when not driven, but during driving, you could be using the windshield wash fluid during driving to get rid of bugs or dirt, and the florida sunshine is so hot, it literally bakes the windshield fluid droplets onto the panel within minutes.

Just as people would tell you to never wash and dry your car in bright sunshine, same idea, water-spots on your paint can be really difficult to remove, especially if it has baked into your clearcoat.

Changing the panel altogether is an (expensive) option, wrapping it makes sense too.
 

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It seems as if that trim panel is not suitable for use as an exterior automobile component if it cannot tolerate windshield cleaning solution.
Well you can say the quality engineer who approved this part for use in the CLA probably didn't do his/her job properly, to assess the durability of the panel material under the most stringent conditions.

But at the same time, you can also say all car manufacturers did not do their job properly to ensure that their paint will stand up to the diverse weather conditions, hot sun, hard water, acidic water or rain, and the consumer not drying the car properly (allowing water spots to form) ..etc etc etc...

At the end of the day, within the first three years of car warranty, any defects will be or should be dealt with by the dealer. After that, it's really on the owness of the consumer to take care of the car.
 

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2018 CLA 250, had the same problem. At first I thought it was buffed too much. Had a body shop paint it and said it’s good to go now (with a warranty from the body shop). Time will tell…
2018 model, was there no "new car" warranty to cover the defect?

I never polished that panel, never needed to. Simply wash, applied spray car wax or lately, Turtle Wax hybrid ceramic spray coating. Looking about the same as when I first drove it out of the shop.
 
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