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Not sure about any grinding as part of the rendering or before. We don't believe so. Windows were supplied and fitted by window company. Thanks for your thoughts!

No work has been done near the house since it was rendered. It's very strange. Others have suggested insect droppings. Neighbours windows opposite on the same driveway have no issues at all. Window company say it's definitely not the new windows at fault. Dry verge above was removed and...

We recently had our gable wall rendered with K-Rend and have these marks appearing on the three windows and sills on the gable end. No marks on the front or rear windows of the property. We’re trying to work out where they’re coming from. It’s so hard to try to remove them. Could it be from the...

Does anyone have any suggestions as to how we get these marks off our relatively new windows and sills. We have no idea where the marks are from but it looks like rust and you can scrape the larger marks off under your nail but leaves a rust coloured mark. We’ve tried UPVC window cleaner and...