uPVC door panels gone grey/yellow

Jul 11, 2020
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United Kingdom
Hi have a four-panal UPVc front door. The windows in the house all have an 02/07 date in the frame, but there is no date in the door frame, so we can only assume it was installed in 2007 as well.

The central panel in the door that contains the four panels is now a slightly different colour to the frame. It is a lot duller/slightly yellow/grey, and this is the same on the inside as well as the outside of the door (so not sun damage). We can only assume that the discolouration is due to age.

Is there anything we can do to 'whiten' it please, even if it is only from the outside?


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