The vast majority of window cleaning is pretty basic; dirty glass is easily cleaned using water, a glass cleaner, a scrubber (washer sleeve), and a squeegee. Unfortunately (or fortunately depending upon your perspective), mineral deposits, residue and other forms of pollutants are more stubborn, and don�t simply wash away using this method. More serious tools are commonly used to remove these tougher problems and make the Window Cleaner look like a star.
Most people don�t realize that glass is not actually perfectly smooth; if it was it would be easy to remove most forms of dirt. Glass surfaces are pitted with microscopic indentations and this allows solids to bond to the surface. Fortunately for you, a variety of chemicals can be used to rid glass of even the most stubborn deposits. Here is a list of the types of dirt and damage you will come up against, and some of the tools you can use to restore the glass to almost new condition.