So window cleaning with construction dirt is, depending on the degree of contamination, a challenging task even for an experienced window cleaner. Since these are also ESG and VSG panes, as a layperson I would use the following materials:
- Bucket of warm water
- Dish soap
- Microfiber cloth
- Plastic scraper/wooden scraper (No metal scraper!)
- Walnut pad
- Several cloths (material doesn't matter, as they are only for catching water)
Place cloths in front of the window so they catch the dirty water. Mix the dish soap with the warm water and apply it to the window using your microfiber cloth. Repeat this process until the coarse dirt is removed. Then moisten the pane again and rub the remaining dirty spots with the walnut pad (repeat). If there are still stubborn spots that cannot be wiped away: carefully use a plastic/wooden scraper. The same applies to the frame. Why no metal scraper? The metal scraper is not suitable for ESG and VSG during window cleaning, because the glass is under pressure and can shatter!
I hope I could help.