The arrays around Bown Crossing sit on 2005-and-later rooflines: asphalt shingle, moderate pitch, most of them facing south or southwest over a garage or single-story wing. That geometry sheds rain fine and sheds dust poorly. What we actually find on the glass here is canal water, canyon grit and cottonwood.
Three dirt sources hit these roofs and they do not behave the same. Canyon wind comes down the Boise River corridor past Lucky Peak carrying real grit, and it lands hardest on the exposed south and southwest planes where the modules are. Ag and construction dust drifts in from the west and from the lots still going in around Barber Valley and Harris Ranch, a fine tan silt that bonds once it gets damp overnight. Then cottonwood off the Greenbelt, late May into June, which does not lie flat the way dust does. It packs into the lower rail and the frame edge and builds a dark band across the bottom of every module. That band matters more than the haze in the middle, because a shaded strip across the bottom of a cell string drags the whole string down, not just the part it covers.
The pressurized Boise Project irrigation on this side of town throws hard, and it is untreated canal water. On a two-story roofline that is not a problem, the array is out of reach. Where we see it is low-mounted glass: modules over a single-story wing, over the garage, on a patio cover, or on a ground rack in the back yard. One misaimed head catches the bottom row every cycle from April to October, and by August you have a white mineral crust banded where the water dried. Boise tap runs roughly 10 to 13 grains of hardness and canal water is no better. We rinse with 100% pure deionized water, which has nothing dissolved in it and leaves no soap film sitting on the cells. Be straight with yourself about one thing, though: scale baked on across several seasons does not always release fully, and the real fix is moving the head.
Most of Bown Crossing went up from about 2005 on, and the roofs show it: asphalt shingle, roughly a five-in-twelve to six-in-twelve pitch across the single-story and garage wings, steeper over the two-story great-room forms. That pitch is shallow enough that rain does not truly rinse a module, which is why panels here can look clean from the street and still be down several percent. Orientation is mostly south to southwest, so the array bakes in full afternoon sun and whatever lands on it sets hard. We work with water-fed carbon poles from the ground wherever the reach allows, which on a garage or single-story array is usually the whole job. Where we do have to be up top we stay on shingle at the edge and never step on modules. Lots are tight and garages are often alley-loaded, so tell us where to park when you book.
Washing recovers output lost to soiling. It recovers nothing else, and knowing the difference saves you money. Panels give up about half a percent of rated output per year to normal degradation, so a 2013 array is legitimately down six or seven percent and no amount of washing brings that back. Shading is the other one. The street trees and back-yard maples planted with these houses around 2006 are twenty years old now, and plenty of them clip an array for an hour or two of the afternoon. That loss is real and stays until somebody prunes. And if production fell off a cliff instead of drifting down over a season, that is hardware: a tripped microinverter, a dead optimizer, a string offline. Call your installer first. Dirt costs you a few percent, not a third. If you have had a good soaking rain in the last week and the glass reads even, you can wait.
Solar cleaning is quoted per array rather than at a flat rate, because pitch, height, module count and access all change the work. If we are already at the house for windows, adding panels to the same visit costs less than a separate trip, and Bown Crossing, Harris Ranch, Columbia Village and Barber Valley sit close enough together that we can usually get out same-day or next-day. We run Monday through Saturday, 7am to 7pm, closed Sunday. Memberships are Monthly or Quarterly with no contract, and the 7-Day Rain Guarantee covers you if weather undoes the work inside a week. Reflekt is Hunter Stevens and Ethan Seusy, founded in 2025, fully insured and locally owned, 4.9 stars across 115+ Google reviews. Call (208) 453-6760 for a per-array number.
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In a dry Boise summer with no rain from July into September, uniform dust on a shallow-pitch array typically costs single digits, call it five to ten percent by late August. Cottonwood banding along the bottom rail can cost more than that because it shades a whole cell string. If your monitoring shows thirty or forty percent gone, that is not soiling and a cleaning will not fix it.
That makes it worse here. Canal water and Boise tap both carry enough dissolved mineral to dry into a hard crust on the glass, so a rinse cycle in July leaves you with spotting on top of the dust. The reason we haul deionized water is that there is nothing left in it to dry on. If you do rinse yourself, do it at dusk on cool glass and expect spots.
Usually not. On garage-mounted and single-story arrays, which is most of what is out here, water-fed poles reach the whole array from the ground. On the steeper two-story planes we may need roof access, and in that case we stay on shingle at the eave and work in from the edge. We do not step on modules at any point. Frame flex and micro-cracks are not worth the shortcut.
No, and we will tell you that before we quote it. These houses were landscaped around 2006 and those trees are full size now. Shade is a geometry problem, not a dirt problem, and washing glass under a canopy changes nothing about the hours you lose. Pruning or removal is the only lever. What cleaning does help with is the pollen and leaf litter that heavy canopy drops onto the array.
Two useful windows. First is right after cottonwood quits, usually the last week of June, so the fluff banded along the lower rail comes off before peak production season. Second is late September, after wildfire smoke season has laid ash down and before the sun angle drops for winter. If you only do one, take the June one. That is the visit that protects your best production months.
No soap, no chemicals, no abrasive pads. We use 100% pure deionized water with soft brush agitation, which is what most module manufacturers specify in their operations and maintenance documents. Soap is the thing to avoid on panels anyway, because residue film stays on the glass and attracts the next round of dust. If your installer gave you an O and M sheet with specific instructions, send it over and we will follow it.
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