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I am very fortunate to have been donated a commercial greenhouse, with all it's lovely opening roof and louvre vents intact. We have cut down the original size to 8' h x 10' w x 13' l. As you can appreciate the area of glass in this is considerable. The problem is that the white shading material, probably 'Coolglass' has been left on for a considerable time and we are finding it very difficult to clean. Some of the panes are almost completely opaque. I'm not so concerned for the summer, when we would be applying shade anyway, but in winter when light levels are low and short, my plants may suffer. I plan to overwinter chillies, in a separate heated area, hence my concern. To date we have tried using hot water and detergent solution; proprietary glass cleaner; methylated spirits; white spirit; a very sharp fine scraper designed to remove adhesive labels from surfaces; t-cut; xylene; and somebody recommended sugar soap which we tried.
As you have probably guessed none of these have worked. Have you any other suggestions please? We live in Berkshire and the greenhouse runs E to W. Some 50% of the glass is in this condition. Kitting out a new greenhouse as you know is expensive so replacing the glass is not an option.
Help please, we don't know what else to do?