i had a house this week who complained the pure water was leaving white on the bottom 12" of the window :
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i look at the window, it has loads of white on it, just above it, is the water overflow outlet :
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needless to say the overflow was dripping every so often and hitting the window cill
i was asked to clean it off, i wasnt going to bother to get my ladders for this un
so i asked the lady of the house for some "limescale remover" she gave me a bottle of it, i poured it onto a old brush head and brushed the window, in about 10 mins i cleaned the window with a good rinse of pure water then cleaned it as i would have normally
the window came up a treat, i slung my "tescos value broom head" in the car and away i went, 1 happy customer