![]() Fan jets are used for hydrophobic glass, and "pencil" jets are used for hydrophilic glass. The brush is used to agitate the debris off the window, while spraying water, and then the brush is lifted a few inches from the glass to rinse the glass with the pure water jets. The amount of spotting would depend entirely on what mineral composition is the water. The reason for this is that if using above zero ppm water, reach and wash water-fed pole window cleaners cannot claim to be purified water window cleaners and subsequently, a reading above 0 ppm could lead to spotting on the glass. The filtered water should contain a TDS (total dissolved solids) of 0 ppm (parts per million) when being used on windows. The water is filtered by either a two-stage or three-stage filtration process, involving a carbon filter, and two de-ionization filters, or a carbon filter, a reverse osmosis membrane filter, and a de-ionization resin filter. Water-fed poles - Any of a variety of types of telescopic poles, fitted at the upper end with a brush and water jets, fed either from vehicle-borne tanks of deionised water or by on-site production of deionised water using a domestic or commercial water outlet.In sub-freezing temperatures, anti-freezing chemicals are added to the solution to prevent it from crystallizing on the pane before it is sluiced off. Chemicals added to the solution range from dish soap and glass cleaner to Trisodium Phosphate and etching salt. A squeegee is then used to sluice the dirt and water mixture from the glass. Water and squeegee - Generally, chemicals are added to water, and a device such as a brush or cloth-covered handle is dipped into the resulting solution and used to scrub glass.Chamois and scrim - Chamois is used to loosen and remove dirt, followed by a buffing with scrim or cheesecloth.Window cleaning with a water-fed pole in Bath, England
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