Columbia Village went up mostly between 1990 and 2007, which means stucco walls with hardboard or vinyl above, and pressurized canal irrigation hitting the bottom four feet of it every night. Three different stains show up on those walls, and only one of them is actually dirt.
Walk this neighborhood and the siding mix repeats house to house. Almost everything was built between 1990 and 2007, which in Southeast Boise means a three-coat stucco or synthetic stucco body, hardboard or early vinyl on the gables and second story, and a brick or stone wainscot across the front of the bigger lots. Each one fails differently. Stucco holds mineral in its texture like sandpaper. The pressed-fiber lap siding of that era, LP or Masonite depending on the builder, drinks water at the cut bottom edge and swells if you push water up under the lap. Vinyl from the same years has thinned and gone chalky on the sun side. A crew that treats all three the same is how you end up with a swollen bottom course or a streaked south wall, so pressure and chemistry get set per elevation, not per house.
The most common call here is a tan-to-gray band running three or four feet up the wall, worst on whichever elevation has a head aimed at it. That is not road dirt. Columbia Village runs on Boise Project pressurized irrigation off the New York and Ridenbaugh canals, so what hits the wall is untreated ditch water carrying silt, algae and dissolved mineral, and it lands on hot dry stucco under pressure. The silt and the organic film wash off. The mineral is the honest part. Once calcium has cycled through a stucco wall for ten summers it is in the texture, not on it, and soft washing takes that band from obvious to faint rather than to gone. If your wall has been getting hit since the house was new, expect a change you can see from the curb, not a factory finish. Re-aiming the head is what keeps it from returning.
Green or black growth on a north wall is a different animal from irrigation staining, and it comes down to sun and airflow. North and shaded east elevations here stay damp long after the south side has flashed dry, and the foundation planting that went in with these houses does not help. The arborvitae and burning bush that were knee-high in 1998 are against the wall now, holding moisture in the six inches where siding meets bed. That strip is where algae seeds itself first. Soft washing kills the growth instead of shearing it off, which is the whole point: pressure knocks the green off the surface and leaves the roots down in the stucco pores, so it is back in a season. If yours regrows fast, cut the shrubs back eight to twelve inches off the wall and a wash will hold roughly twice as long.
Run your hand down the west or south wall of a Columbia Village house in August. If it comes back white, that is chalk. The binder in the paint, or the surface of the vinyl, has broken down under full sun, and these blocks have almost no mature canopy to shade anything. Nothing intercepts sun from June through September at ten to fifteen percent humidity. Chalking is worth understanding before you pay anyone to wash it. It is not dirt, and no cleaning reverses it. What a soft wash does is pull the loose oxidized layer off evenly, so the wall stops looking blotchy and stops running white streaks down the trim every time it rains. Heavily chalked paint is a paint problem, and we will say that on the walkthrough instead of selling a wash you will be unhappy with. Pressure washing chalked siding only strips it unevenly.
Soft wash is $0.18 per square foot and is the only pressure we will put on stucco, EIFS, hardboard or vinyl. Detergent does the work at low pressure, dwell time does the rest, and the wall gets rinsed top down so no section dries mid-run. We pre-wet the foundation beds, keep the wand angled down so water is not forced up under lap siding, and stay off the weep screed at the base of a stucco wall. If you want glass done too, windows get a separate 100% pure deionized water pass after the siding, because house-wash runoff will spot them. Memberships run Monthly or Quarterly with no contract, every job carries the 7-Day Rain Guarantee, and same-day and next-day slots open most weeks. Reflekt was started in 2025 by Hunter Stevens and Ethan Seusy, is locally owned and fully insured, and holds 4.9 stars across 115+ Google reviews. Call (208) 453-6760.
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Most of it. The silt, algae and organic film come off cleanly. The mineral does not always, because canal water that has hit the same wall every summer since the house was built leaves calcium embedded in the stucco texture rather than sitting on top of it. Expect a clear improvement from the street and a faint shadow up close on the worst elevation. If a wall is in that category, we tell you before we quote it.
Tap it with a knuckle. Traditional three-coat stucco over lath sounds hard and solid. EIFS, the synthetic foam-board system used on plenty of mid-90s and 2000s builds here, sounds hollow and gives slightly. It matters because EIFS is foam and mesh under a thin coating, and pressure drives water behind it where it has nowhere to drain. Both get soft-washed, but EIFS gets lower pressure and more standoff distance.
We can slow it down a lot. Soft washing uses a solution that kills the growth at the root instead of shearing it off, so regrowth has to start from nothing rather than from what is left in the pores. The rest is airflow. Shrubs tight to the wall and a head wetting the base keep that strip damp all summer. Pull the plants back eight to twelve inches, move the head, and one wash usually holds a full year.
Washing evens it out, it does not undo it. That powder is chalking, meaning sun has broken down the paint binder or the vinyl surface, and no cleaning restores a finish that has already oxidized. A soft wash removes the loose chalk uniformly so the wall stops looking patchy and stops streaking the trim in rain. If the chalk is heavy across a whole elevation, the honest answer is that it is due for paint, and we will tell you that.
If you can, turn off the zones along the walls we are washing the night before, so the siding is not soaked when we arrive and the beds are not already saturated. Afterward, wait until the wall is dry to the touch, usually a couple of hours in a Boise summer, then run them as normal. And if a head is hitting the house directly, re-aiming it is the fix that keeps the band from coming back.
Yes, and the order matters. House-wash runoff carries detergent and everything that came off the wall, so glass gets done after the siding, never before. Windows are cleaned with 100% pure deionized water and no soap, so nothing is left behind to dry into a spot. Most people here book both together anyway, since the same irrigation water that stains the stucco is what is spotting the upstairs glass.
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