Glass Corrosion
Just as metal rusts, glass is subjected to a corrosion process caused by reactions between the glass surface and gases in the atmosphere. Even a single droplet of moisture on unprotected glass can
produce sufficient damage to be visible in good lighting.
The surface of glass is not smooth and consists of microscopic peaks and potholes. Both organic and inorganic contaminants fill these potholes and chemically react with the glass, firmly bonding to the surface. Because of this, cleaning glass becomes more difficult and visibility deteriorates
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