Most of Sterling Ranch went up between 2015 and 2020 — vinyl lap siding with stucco and stone veneer across the front elevations. Ten years in, those walls stain in three predictable places: the sprinkler band along the bottom, the shaded north wall, and the sun-bleached south side.
Sterling Ranch went up in Kuna's 2015-2020 building wave, and the builders in that stretch used a consistent recipe: vinyl lap siding over most of the house, with stucco, stone veneer, or board-and-batten accents on the front elevation where the street sees it. A handful of plans carry fiber cement on the gables. That mix is the whole reason house washing here is not one setting on a machine. Vinyl takes soft-wash chemistry well and hates pressure — hit a lap seam wrong and you drive water behind the siding and into the housewrap. Stucco is more brittle than people assume and will spider-crack under a tight tip. Stone veneer sheds mortar sand if you lean on it. We wash the whole envelope at low pressure, let the cleaner do the work, and rinse from the top down.
Kuna runs on pressurized irrigation from the Boise-Kuna Irrigation District, not treated city water, and it's on from roughly mid-April through mid-October. That untreated canal water carries silt and dissolved minerals, and on Sterling Ranch's bigger lots the heads throw far enough to hit the house. What you end up with is a band across the bottom two to four feet of wall: chalky white on the vinyl, orange-brown where iron sets into stucco and stone. Here's the honest part. Soft washing lifts the loose mineral film and the dirt riding on top of it, and it makes a real difference you can see from the curb. But where that water has dried on the same spot for five summers straight, some of the staining has etched into the surface. We can lighten it. We can't promise to erase it, and anyone who promises that is guessing. The real fix is turning those heads so they stop hitting the wall.
Walk around a Sterling Ranch house in March and the north elevation reads a different color than the south. That's not dirt — it's a biological film, algae with some mildew, growing where the wall never gets enough direct sun to dry out. It's worst on the true north side, in the shaded slot between houses on these tighter side yards, and behind any fence panel or shrub row that kills the airflow. Vinyl's woodgrain texture gives it something to hold onto, and the corner near the hose bib and the AC pad is usually the darkest square footage on the whole house. Pressure alone knocks the top layer off and it's back within a couple of months, because the roots are still there. A soft-wash solution with real dwell time actually kills it, which is why the north wall stays clean into the following season.
The south and west walls have the opposite problem. Years of high-desert sun break down the resin at the surface of vinyl siding and leave a fine powder on the face of it — oxidation, or chalking. Easy test: press a dark rag flat against the sunny wall and drag it sideways. If it comes away coated in white powder, that's chalk, not dirt. This matters because chalking looks exactly like a filthy house and does not behave like one. Washing removes the loose chalk and evens the color, so the wall reads clean instead of blotchy, and it stops that powder from streaking down over the windows every time it rains. What washing cannot do is put pigment back into the siding. If the chalking is heavy, you're looking at painting or replacing the vinyl, and we'd rather tell you that on the walkaround than after the invoice.
House washing runs $0.18 per square foot of wall surface and is safe on every siding type in this neighborhood — vinyl, stucco, stone veneer, fiber cement. We measure actual wall area, not floor-plan square footage, so a two-story plan on Snowfield or Meadowfield with a tall entry element prices out differently than a single-story on the same street. Before we start we pre-wet and cover the plantings under the drip line, cap exterior outlets, and ask that windows are latched and any pets are in. Most houses here take part of a morning. Same-day and next-day slots run through Kuna regularly. Memberships are Monthly or Quarterly with no contract, and every job carries our 7-Day Rain Guarantee. Fully insured and locally owned — Hunter Stevens and Ethan Seusy started Reflekt in 2025, and we're at 4.9 stars across 115+ Google reviews.
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It will lighten it a lot, and on newer homes it usually comes off completely. That band is mineral deposit from pressurized irrigation water hitting the wall. Once it has baked on for several seasons it can etch into the vinyl or stucco surface, and no amount of chemistry or pressure takes etching out. We'll tell you which one you have before we quote it, not after.
Yes, and it's the only method we'll use on them. Stucco cracks under concentrated pressure and stone veneer loses mortar sand if you blast it. Soft washing applies cleaner at low pressure, lets it dwell, then rinses. It's the same reason we won't run a turbo tip along vinyl lap seams — the water goes behind the siding and you don't find out for a year.
Shade. The north elevation and the narrow side yard between houses never get enough sun to dry out, so algae takes hold in the texture of the siding. It's not a sign anything is wrong with your house. It does need a solution that kills the growth rather than just blasting the surface layer off, or it's back by midsummer.
Just skip the cycle that morning if it's easy to do. A wall that's already soaked with mineral-heavy canal water dilutes the cleaner and works against us. We also want the beds around the foundation damp but not flooded, since we pre-wet the plantings ourselves before any product goes on the wall.
Once a year handles most homes here. If your north wall greens up early or a sprinkler head is spraying siding all summer, you'll want it more like every six months on those elevations. Quarterly membership makes sense mostly for homeowners who are already having windows done and want the whole exterior kept up on one visit.
No, and it's worth knowing that up front. Fading on the south and west walls is UV oxidation in the vinyl itself. Washing clears the chalky powder sitting on top, which evens out the blotchiness and stops the rain streaking, so the wall looks dramatically better. But the original pigment is gone. Painting or new siding is the only thing that restores it.
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