Downtown's grid was platted long before anybody in Nampa had a pressurized irrigation system. The bungalows south of Front Street water off the city line, and Nampa's deep-well water is hard, so a sprinkler head sitting six feet from a narrow lot's foundation leaves calcium on the same three windows every morning for years.
Nampa's pressurized irrigation districts mostly cover the subdivisions out on the edges of town, where a developer put in one system for the entire plat and every yard pulls from the same canal source. The grid around Front Street and the avenues south of it predates all of that. Most of these lots water off a hose bib or a retrofit sprinkler zone plumbed straight into the house line, which means the water hitting your windows every morning is Nampa's deep-well city water. That water is hard enough to leave a ring in a dog bowl inside a week. Canal water leaves a chalky silt film that mostly rinses off. Hard tap water leaves dissolved calcium that bonds to the glass and, given a couple of summers, starts eating into it. Two houses a mile apart, same sun, completely different glass.
Lots down here run narrow and deep, plenty of them twenty-five to fifty feet wide with the house set close to the sidewalk. There is nowhere to put a sprinkler head that is not within six feet of a wall, which is why the damage clusters so predictably. Basement and daylight windows at grade take direct hits and are usually the worst glass on the property. Lower sashes on the side elevations catch the throw off the neighbor's system as often as their own, because the fence line splits two yards twenty feet apart. On a story-and-a-half bungalow, an old brass impact head at the corner will reach second-story glass, and homeowners rarely believe that until they see the spray pattern at six in the morning. South and west elevations are worst, since the droplet bakes dry on the pane instead of running off.
Run this test yourself before you call anybody. Wet the pane with a spray bottle and watch the spots. If they vanish while the glass is wet and reappear as it dries, the mineral is sitting on top and we can take it off. If the spots stay visible on wet glass, or you can catch the edge of one with a fingernail, the calcium has gone into the surface and left pits. That is etching, and no chemical brings it back. Polishing with cerium oxide can knock the haze down on clear annealed glass, but it is slow, it is quoted by the pane, and it has no business on tinted, filmed, or exterior-coated glass, because the compound takes the coating off with the stain. If your windows are that far gone, we will tell you it is a replacement conversation, not a cleaning one.
We start on the worst pane rather than the easiest one, because that pane tells us how the rest of the house will go. The glass gets washed first so we are working on mineral instead of dirt, then the stain gets a dwell with a mineral dissolver and a non-scratch pad worked in overlapping passes, then a full rinse and a pure deionized-water finish so nothing we used dries back onto the pane. Frames, sills, and painted siding get wet down before and after, because the products that cut calcium do not belong sitting on anodized aluminum or hundred-year-old paint. Pressure will not do this. Water pressure moves dirt and has nothing to grab on a chemical bond, and on an old wood sash it just drives water past the glazing putty.
Removing the stain is half the job. If the head that caused it is still aimed at the house, you are looking at the same glass again next spring. Go out at five or six in the morning and watch your zones run, because most people never have. What we usually find downtown is a head that got shifted when somebody built a raised bed, a nozzle worn wide with age, or a fixed spray still set for a lawn that has since been replaced with rock. Turning a head fifteen degrees or dropping in a smaller nozzle is a ten-minute fix that protects the work you just paid for. On the mixed-use blocks the same thing happens to storefront glass from planter drip and tenant systems overhead. Stain removal is quoted by severity and included on the Monthly membership. Call (208) 453-6760.
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Usually three things: what water feeds the system, how old the heads are, and where they point. On the old grid most lots run off city tap water, which is hard, but a system installed last year with matched nozzles aimed at the lawn throws almost nothing at the wall. A 1990s retrofit with worn brass heads six feet off the foundation soaks the same three windows every morning for years.
Depends what your sprinklers are plumbed into. Canal water off a pressurized irrigation system carries silt, so it leaves a gritty film that mostly rinses away. Deep-well city water carries dissolved calcium, and that is what bonds to glass and etches it. Most of the old core waters off the house line, so what you are looking at is almost always tap water. Check whether you have a separate irrigation meter or pump.
Not if the source gets fixed. Mineral only lands on the glass because water is hitting it, so we tell you which head to turn before we leave. Left alone, a window watered every morning will haze again within a season and be back where it started in two or three. On the Monthly membership stain removal is included, which keeps light scale from ever becoming etching in the first place.
No, and anyone who says yes is going to cost you a window. Hard water spots are a chemical bond, not dirt sitting on top, so pressure has nothing to grab. On a downtown house that old it does real harm: water gets driven past the glazing putty on a wood sash, and it will strip chalky paint off a 1920s casing. We use pressure washing on concrete and siding, never on mineral-stained glass.
By severity, after we look at it. A pane with one season of light scale takes a single pass. A basement window that has been watered for fifteen years might take three passes and a polish, or might not be savable at all. We test one pane, tell you which category your glass falls into, and quote from there. It is included on the Monthly membership, and same-day or next-day slots open most weeks.
It changes how we work but does not rule the job out. Old wavy glass, single-pane sashes, and dried-out glazing putty all take a lighter hand, and we keep the dissolver off the putty line and the sill. The bigger issue on houses this age is that the spots may be decades old, which means the etching runs deeper than any chemical reaches. We check that first and tell you straight.
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