Pure Water Window Cleaning
Pure water window cleaning washes glass with purified, mineral-free water delivered through a long pole with a soft brush, then lets the glass air dry. Because no dissolved minerals remain, the glass dries spot-free without squeegeeing, and the pole reaches upper windows safely from the ground.
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In depth
Tap water leaves spots because dissolved minerals stay behind as the water evaporates. Reverse osmosis and deionization strip those minerals out, so the water pulls dirt off glass and frames and dries without residue. It is the standard for tall windows, sunrooms, solar panels, and commercial storefronts. Heavy mineral etching or paint overspray is a different problem and may need hand scrubbing or polishing first. The brush does the cleaning, while the water only carries dirt away and rinses.
How this shows up on our jobs
Madison tap water is hard, which is why untreated water leaves obvious spots on exterior glass. Pure water is how we leave second-story windows clear without ladders.
Services where this matters
Frequently asked
- What is Pure Water Window Cleaning?
- Pure water window cleaning washes glass with purified, mineral-free water delivered through a long pole with a soft brush, then lets the glass air dry. Because no dissolved minerals remain, the glass dries spot-free without squeegeeing, and the pole reaches upper windows safely from the ground.
- How does Pure Water Window Cleaning show up on our jobs?
- Madison tap water is hard, which is why untreated water leaves obvious spots on exterior glass. Pure water is how we leave second-story windows clear without ladders.
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Related terms
Water-Fed Pole (WFP)
A water-fed pole is a lightweight telescoping pole — typically carbon fiber, 20 to 45 feet long — with a soft brush and water jets at the tip, fed by a hose connected to a pure-water filtration system. The technician agitates the glass with the brush while pure water rinses away the loosened dirt, leaving zero mineral residue to dry into spots. When done correctly, windows, frames, and screens air-dry crystal-clear without ladders or squeegees.
Deionized Water
Deionized water — often shortened to DI water — is water that has had essentially all of its dissolved mineral ions removed by passing it through specialized ion-exchange resin beads. Positive-charge ions (sodium, calcium, magnesium) are swapped for hydrogen ions, and negative-charge ions (chloride, sulfate, bicarbonate) are swapped for hydroxide ions. The result is near-pure H2O with a TDS reading at or near zero.
Reverse Osmosis (RO)
Reverse osmosis is a water purification technology that uses pressure to force water through a semi-permeable membrane so fine that it blocks dissolved minerals, bacteria, and most organic molecules while letting pure water pass. In pressure-washing and window-cleaning applications, RO is the second filtration stage: it takes municipal tap water from 250-400 PPM of Total Dissolved Solids (TDS) down to roughly 5-20 PPM before the water hits the deionization resin.
TDS (Total Dissolved Solids)
TDS stands for Total Dissolved Solids — the concentration of dissolved minerals, salts, and metals in water, measured in parts per million (PPM). A TDS meter is the single most important tool in professional window cleaning because it determines whether rinse water will dry spot-free. Standard Madison tap water measures roughly 250-400 PPM, which leaves visible mineral spots on glass when it dries. For streak-free, squeegee-free results with a water-fed pole, rinse water must be at or below 10 PPM, and ideally 0-2 PPM.
Hard Water Stain
A hard water stain is the crystalline mineral deposit that forms on glass, metal, and stone when water high in dissolved calcium, magnesium, iron, or silica evaporates and leaves its dissolved minerals behind. The stain starts as a cosmetic film that rinses off easily; over weeks or months, it bonds chemically to the surface and etches into it, becoming progressively harder to remove. On glass, severe hard-water staining is technically etching — the minerals have chemically fused into the silicate surface and cannot be washed off without specialty chemistry or mechanical polishing.
Squeegee Technique
Squeegee technique refers to the controlled hand-motion pattern used to remove cleaning solution and water from interior window glass without leaving streaks, drips, or wet edges. A professional squeegee technique uses an 18 or 22-inch stainless channel with a fresh rubber blade, a consistent angle (typically 30-45 degrees to the glass), overlapping strokes that catch the entire wet field, a final detail swipe along the bottom edge and sill, and immediate detailing of any missed water around frames and corners with a chamois or lint-free cloth.