Collister runs mostly 1950s-to-70s ranch houses in painted lap siding, and the two things that mark up that paint are sprinkler overspray baking mineral streaks into the lower courses and the foothills' nightly cold-air drainage keeping the north wall damp enough to grow algae most of the year.
Most Collister ranches sit low to the yard with sliders and siding starting a foot or two off grade, right where a rotor or impact head throws its arc. Some of these lots still flood-deliver off the Boise City Canal on a rotation, and that water carries silt and dissolved mineral straight out of the ditch. The rest of the neighborhood runs on Veolia tap, which tests hard on this side of the valley. Either source leaves the same result: a tan or chalky-white streak baked into the bottom few courses of painted lap siding, worst under the trim board where the spray pools before it runs. Afternoon sun sets it before it ever gets a chance to rinse off in the next watering cycle. Our soft-wash mix dwells long enough to break that mineral bond off the paint film instead of just wetting the surface and moving on.
Collister sits right at the base of the Boise Front, and the cool air that drains off the foothills after sunset settles low over these blocks overnight. Paired with the mature maples and spruce that shade a lot of these ranch lots, the north-facing wall stays damp well past what a south wall in a newer, treeless Meridian subdivision ever sees. That combination grows a green-black algae film on painted siding, and it shows up heaviest behind shrubs, under eaves, and anywhere a downspout has been dripping onto the wall instead of into a splash block. It is not a sign the house is dirty in general — it is a shade-and-moisture problem specific to that one exposure, and it comes back faster here than it will on the sunnier sides of the same house.
Run a finger across the south or west wall of an original-era Collister ranch and it often comes back with a fine white powder on it. That is the paint film chalking as the resin binder breaks down under UV, and on houses built in the 1950s through 70s that never got a proper repaint, it is common. Here is the honest part: soft-washing lifts the loose chalk and the dirt sitting in it, and the wall looks noticeably better and more uniform right after, but it does not restore faded color or seal the chalking from coming back. If a wall is chalking heavily, that is a repaint call, not a cleaning call, and we will tell you that at the door instead of running extra passes on a surface no amount of water is going to fix.
Collister is not a single housing stock, and the method changes with it. The tract ranches are mostly painted lap siding over wood or early hardboard, which takes a standard soft-wash mix fine as long as pressure stays low enough not to force water under lapped boards. The older places along the canal on the bigger, tree-covered lots run more painted wood board-and-batten and some original stucco and mortar foundation work, and those get handled with less pressure and a gentler dwell — old mortar joints and dried-out wood trim do not need to be blasted to come clean, and doing it anyway just opens up gaps that let water in behind the siding. Tell us your siding type when you call and we set the equipment for it before we ever start.
House washing runs $0.18 per square foot with our soft-wash method, safe for painted lap siding, older wood, and stucco alike — we adjust the mix and pressure to the surface rather than running one setting on every house. Gutters start at $199, and pressure washing on driveways, walks and patios is $0.20 per square foot using standard soft-wash and pressure methods suited to concrete. Memberships run Monthly or Quarterly, no contract, and Quarterly saves $100 per cleaning. Every wash carries the 7-Day Rain Guarantee — if rain spots or streaks it within a week, we come back and redo it at no charge. Same-day and next-day slots are usually open. Locally owned, fully insured, 4.9 stars across 115+ Google reviews. Call (208) 453-6760.
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It cleans it up but it does not restore the color or stop the chalking. Soft-washing lifts the loose powder and the grime sitting in it, so the wall looks noticeably better and more even right after. But if the paint film itself has broken down from UV exposure, that is a repaint issue. We will point it out rather than run extra passes on a wall that water alone cannot fix.
Shade and moisture, not dirt. Collister sits at the base of the foothills, and the cool air that drains down at night keeps north-facing walls damp longer than the sun-exposed sides, especially where mature trees add shade on top of it. That combination grows algae faster on that one wall than anywhere else on the house. Soft-washing clears it, but expect it to return faster on that exposure than on the rest of the siding.
In most cases, yes. Fresh mineral buildup from canal or tap water lifts clean with a soft-wash dwell that breaks the bond before we rinse. If a head has been throwing on the same patch of painted siding for several seasons, some staining can set into the paint film itself and only fade rather than fully clear. Either way, the real fix is redirecting or adjusting the head so it stops hitting the house.
Yes, that is the point of soft-wash over a straight pressure-washer blast. We drop the pressure and lean on the chemical mix for older painted wood board-and-batten and original stucco or mortar work, since high pressure on dried-out trim or aging mortar joints can force water in behind the siding instead of just cleaning the surface. Tell us your siding type when you book and we set up for it in advance.
Quarterly covers most of the neighborhood well. You're dealing with an irrigation season that runs spring through fall depositing mineral on the lower siding, foothills dust settling through the same stretch, and algae building on shaded north walls close to year-round. Quarterly membership saves $100 per cleaning against one-off pricing. If your lot is heavy canal-side shade or catches a lot of sprinkler overspray, monthly is worth pricing out instead.
Not with our method, and that's why we soft-wash instead of straight pressure-washing painted siding. Full pressure can strip loose or aging paint, drive water up under lap boards, and etch older wood trim. We use low pressure and a dwell-time chemical mix to lift dirt, mineral and algae without stressing the paint film, and we adjust that mix specifically for how old and how chalky a given wall already is.
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