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Anyone know what’s happened to this sill?

WCF

Help Support WCF:

It isn't just the sills, it's also the bevelled part of the frame. It's a similar situation with everyone.

Used to be clean.

Next visit the yellow staining has appeared.

Won't budge.

Not on vertical surfaces only flat/angled.

Only on one side of the house.

It's got to be something being carried on the wind that settles on one side of the house like pesticides from farmers spraying on fields or pollen from maize or rapeseed.

 

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