You may be able to get off crusty or gritty stains by gently using a razor to scrape them off.X Research source Apply the paste to the affected area with a clean cloth and give it a good rub. Make a paste with water and a cleaner that contains oxalic acid, such as Zud or Bar Keepers Friend.Use a sponge or cloth to rub the stain, and proceed with regular cleaning. Specialist Cleaning Supplies specializes in cleaning equipment, cleaning chemicals, floor polish, chemicals for odour control, and urine odour, commercial. Spray the affected area with pure vinegar and let it sit for at least five minutes.Rinse the area with water and proceed with regular cleaning. Dampen a sponge with cleaner and rub at the stains on the windows. Use a mineral deposit removing cleaner, such as CLR.

There are a few methods you can try to remove marks on inside or outside windows:

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