Arroyo Vista sits on 0.15 to 0.22 acre lots between Black Cat and Ten Mile, and that lot size is the whole story on hard water here. There is not much air between a sprinkler head and a window, and the water going through it is untreated Boise-Kuna Irrigation District canal water carrying suspended silt and dissolved mineral.
Sprinkler water loses some of its mineral load to evaporation while it is in the air. On a quarter-acre lot with a head twenty feet from the house, a fair amount of that happens before the water lands. On an Arroyo Vista lot where the head is six or eight feet from the glass, almost none of it does, so the water arrives carrying nearly its full load and dries in place. That is why the spotting here is concentrated and hard rather than a light general haze, and why it traces a visible arc matching the spray pattern.
A mineral deposit sits on top of the glass and comes off. Etching is the glass surface itself corroded by mineral sitting on it through repeated heating cycles, and nothing removes it because there is nothing there to remove. We test a small area before quoting so you know which one you have. Arroyo Vista is new enough that most of what we find here is still deposit, which is genuinely good news: this is the window where the problem is fixable rather than permanent, and it does not stay open forever.
Homes on Arroyo Vista's western rows back onto working ground, and coarse agricultural soil landing on glass that is already carrying wet canal mineral gets bound into the deposit as it dries. That produces a gritty composite rather than a clean mineral film, and it is harder to remove than either one alone. It is also why dry-wiping an Arroyo Vista window is a genuinely bad idea: you are dragging sand across glass with a mineral bond holding it in place.
Pure deionized water has had its dissolved solids stripped out, so it leaves nothing behind as it dries, which is why we use it for every rinse and why there are no spots or streaks afterwards. But it is a rinse, not a solvent. An established mineral deposit is removed mechanically and chemically first, and then rinsed with deionized water so the process does not simply lay down a fresh set of spots. Anyone promising that pure water alone dissolves old hard-water buildup is overselling it.
Stain removal is quoted after we test the glass, because what it takes varies with how long the deposit has been building. What does not vary is that the deposit comes straight back if the head that caused it stays where it is. We identify the offending head and tell you which one it is at no charge while we are on site. A five-minute adjustment is worth more to you than an annual stain-removal visit, and saying so costs us the repeat work, which is rather the point.
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Your sprinkler pattern. On a 0.15 acre Arroyo Vista lot the head can be six or eight feet from the glass, so untreated canal water arrives carrying nearly its full mineral load rather than having partly evaporated in the air. The deposit traces exactly where the spray reaches.
That depends on whether it is deposit or etching, and we test a small area before quoting rather than guessing. A deposit sits on the glass and comes off. Etching is the glass surface itself corroded, and nothing removes it. Arroyo Vista is new enough that most of what we find is still deposit.
No, and we would not claim it does. Deionized water leaves nothing behind as it dries, which is why every rinse uses it, but it is a rinse rather than a solvent. An established deposit is removed mechanically and chemically first, then rinsed so the job does not lay down fresh spots.
If you are on the western rows backing onto farmland, coarse field soil is landing on glass that already has wet canal mineral on it and getting bound into the deposit as it dries. That composite is harder to remove than either alone, and it is why dry-wiping these windows risks scratching them.
If the sprinkler head that caused them stays where it is, yes, within weeks. That is why we identify the offending head and point it out free while we are there. A five-minute adjustment is worth more to you than a repeat stain-removal visit.
Quoted after we test the glass, because the work varies with how long the deposit has been building and whether it has started to etch. We would rather test and tell you it is a straightforward job, or tell you honestly that part of it is permanent, than quote blind.
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