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If your windows look clean the day they are washed but streaky a week later, the problem is usually the water, not the effort. At Bliss Window Washing, we clean glass for homeowners across the St. Louis area using RO/DI purified water instead of soap and tap water. Here is why that one change decides whether your glass just looks clean or actually stays clean.
What Is Actually in Your Tap Water
Tap water is full of dissolved minerals. In much of Missouri, it carries more than 200 parts per million of calcium, magnesium, and other solids. You cannot see them while the water is wet, but they are there in every drop.
When that water dries on a pane, the water evaporates and the minerals stay behind. Those deposits are the spots and cloudy film you notice after a traditional cleaning. The window was not cleaned poorly. It was rinsed with water that left something behind.
How RO/DI Purification Works
Our water-fed system treats the water before it ever reaches your home. Reverse osmosis forces water through a fine membrane that removes most dissolved solids, then a deionization resin strips out what is left.
The result is water measured at close to 0 parts per million. With nothing dissolved in it, purified water naturally pulls contaminants off the glass and holds them. When it dries, there is nothing left behind to form a spot.
Why We Skip the Soap
Traditional window cleaning relies on detergent to break down grime, and detergent has to be squeegeed off before it dries. Miss a corner and you get a streak.
Purified water does the work on its own. A soft boar's hair brush agitates the surface while the water carries dirt away, and the glass is left to dry with no wiping, no soap film, and no residue. Fewer variables means fewer streaks.
Skipping soap has a longer-term payoff too. Detergent residue attracts dust and can dry into a faint haze, so soap-cleaned windows often re-soil faster. Purified water leaves nothing behind for dust to cling to, which is part of why the results hold up.
Cleaning From the Ground, Safely
The same system feeds water up a lightweight pole, so we reach second-story and hard-to-access windows from the ground on most homes. That keeps our technicians off tall ladders leaned against your siding and gutters.
It is safer for our crew and easier on your property. Nothing rests against the house, and there is no foot traffic through your landscaping or up against fragile trim.
What This Means for Your Home
Cleaner glass that stays clear longer is the obvious benefit, but the method matters for the details too. Purified water is safe around plants, pets, and painted surfaces because it contains no chemicals.
It also means fewer cleanings for the same result, since glass that dries residue-free holds its clarity longer than glass rinsed with tap water. For homeowners in Chesterfield, Kirkwood, St. Charles, and the rest of the metro, it means a window cleaning that holds up instead of fading within days.
If you are tired of paying for clean windows that spot over within a week, the water is worth rethinking. Call Bliss Window Washing or request a free quote, and we will show you what purified-water cleaning looks like on your own glass.