These impurities are known as TDS/Total Dissolved Solids which are measured using a process know as PPM/Parts Per Million. The South West is well known for being a hard water area and so the typical TDS from any water supply in this part of the country will probably be around 300PPM. The cause of smears and marks after cleaning them is impure water, both in the water and on the glass and in the frames. If 100% pure water is used, when dry, it will leave your windows looking perfectly clean and bright.
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