Grey stripes on uvpc conservatory

Sukie_2

Not sure if this is the right place for this!
We had a conservatory built two and half years ago and are finding the white frames are going a grey colour in places and we have distinct grey/black stripes on the top widows under the guttering. We used the same firm that put in the windows about 11 years ago and they are all fine. When the company came to look they said it was caused by the sun/weather and to be expected, but this is happening on all 3 sides and one side is sheltered. None of the frames have been cleaned with anything abrasive, only the correct cleaner.
Is the company correct in what they say, should we expect this after such a short time?
Anybody any answers please?

markie1980

Sounds like the stripes could be water marks where dirty water runs from drainage holes or leaky gutter etc.
Should clean up with Cif or special pvc cleaner.

It definatly shouldn't be permanant damage after that length of time.