Tuffers
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Well, I did it today and what a mare! The windows and frames had been covered in plastic sheeting to protect them from the rendering etc. Some of the frames had been scratched badly, which I pointed out, but the worst thing was the glass. I could get the compo off using a scraper and finger nail, but the glass on some of them had stains all over them. Very large panes of glass were covered in what looked like hard water stains or oxidisation. Nothing would shift them, even limescale remover. I'm thinking the lime out of the mortar has got behind the covers and been left to sit for so long. It took 4 1/2 hours and he wants me to have another go at it when the scaffolding comes down in 3 weeks. Any ideas what might shift the stains? They look terrible. You might be able to see what I mean in the picture below.