Highlands driveways are short, steep and pointed downhill at the valley. That grade off Bogus Basin Road is why the concrete up here looks the way it does: decomposed granite tracked down from the hillside, juniper berry stain along the edges, and a white sprinkler rime where the slope holds water.
First is decomposed granite. The hill sheds pale quartz and feldspar grit onto every path, gravel bed and DG border up here, and it gets walked and driven into a broom finish until the whole slab reads gray. That one is mechanical — it comes out with a surface cleaner and enough passes. Second is juniper and pine. Berry drop leaves a purple-brown tannin blush along the drive edge, and a needle mat left through winter prints its own rectangle. Tannin is chemical, so more pressure does nothing but etch the concrete around it; it needs a cleaner and dwell time. Third is sprinkler scale. Municipal water up here runs roughly 10 to 13 grains, and a head throwing onto the drive all summer builds a chalky calcium rime on the low edge. We look at which of the three you actually have before anything gets turned on.
Gravity helps the rinse and hurts everything else. Cleaner applied at the top of a Highlands driveway runs to the bottom before it has done any work, so it gets applied from the bottom up in bands across the slope, held wet, then rinsed top down. Skip that and you get a clean apron and a dirty crown. Runoff matters too: these lots drain to the street and the street drains toward the Crane Creek side, so we keep the slurry out of downhill planting beds and do not let a sediment river run into a neighbor's yard. The other foothills detail is the shoulder. If there is a DG border or gravel bed along the drive, hitting it early scatters grit back across everything you just cleaned, so edges get cut pressure and go last. Streets up here are narrow, so we park once and pull hose.
Most of this neighborhood was poured between about 1960 and the mid-1980s, and two finishes dominate: gray broom finish and exposed aggregate, which was everywhere on the seventies and early-eighties builds. Forty-plus years of foothills sun, freeze-thaw and snowmelt have worn the cement paste at the surface thin. Put a narrow tip close to that and you pop aggregate loose and cut wand stripes into the slab — permanent, and impossible to sand out on a driveway. We run a rotating surface cleaner at a fixed standoff so the pattern is uniform edge to edge, and drop pressure on aggregate, mortar joints and brick ribbon inlays. Paver patios come with a warning: any real cleaning takes joint sand out, and the joints need re-sanding afterward or weeds find them by August.
Deicer damage is the big one on this hill. Salt on a steep winter driveway spalls the surface, and washing a spalled slab lifts more loose flakes and can make it look worse than it did. If yours is flaking, we wash it gently or tell you to leave it alone. Old motor oil that has soaked into unsealed porous concrete is the second. A degreaser and dwell pulls most of it, but a shadow usually stays, and anyone promising a stain that old comes out completely has not looked at your driveway. Rust from a rebar chair, a fertilizer spill or a metal patio chair is a chemical removal, not a pressure one, and on soft old concrete it often lightens rather than disappears. Also: if you plan to seal, let the slab dry a few days first.
Pressure washing is $0.20 per square foot on driveways, patios and walkways, so a typical Highlands driveway of roughly 600 to 900 square feet runs about $120 to $180, and we can quote off the address and a photo. Best timing is late April into May, after the March snowmelt has finished sheeting silt down the streets, with a second look in fall once the juniper berries have dropped. Memberships are monthly or quarterly with no contract, and it is worth stacking a wash with window or gutter work on the same visit so the crew only takes one narrow street parking spot. Every job carries our 7-Day Rain Guarantee. Reflekt is locally owned, fully insured, 4.9 stars across 115+ Google reviews, with same-day and next-day slots often open. Call (208) 453-6760.
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It is $0.20 per square foot. Highlands driveways tend to be short and steep rather than long, so most land between 600 and 900 square feet, or roughly $120 to $180. Walkways and patios price the same way. Send a photo of the drive from the street with the address and we can put a number to it over the phone at (208) 453-6760.
Not the way we run it. The risk on aggregate is a narrow tip held too close, which blasts the cement paste out from between the stones and eventually works pebbles loose. We use a rotating surface cleaner at a fixed height and lower the pressure on aggregate, mortar joints and brick inlays. If your slab is already losing stones before we start, we will point it out and back the pressure down further.
Usually most of it, rarely all of it. Fresh drips on sealed concrete come up clean. Years of drips soaked into an unsealed 1970s slab are a different story: degreaser and dwell time pull the bulk, but a shadow typically stays in the pores. We will tell you which one yours looks like before we start, because paying to chase the last 20 percent of an old oil stain is usually not worth it.
Probably not yet, or only gently. Flaking on a steep foothills driveway is almost always deicer spalling — salt gets into the surface, freeze-thaw does the rest. Pressure will strip off more of the already-loose surface and leave you with a rougher, patchier slab. We would rather look at it, wash it at low pressure or tell you honestly that what it needs is a resurfacer, not a cleaning.
That is almost always sprinkler scale. Municipal water here runs about 10 to 13 grains per gallon, and at 100 degrees with ten percent humidity the overspray flashes dry on the concrete and leaves the calcium behind. It builds a rime you can feel with a fingernail. It responds to treatment rather than raw pressure, and it comes back unless the head gets turned or adjusted off the hardscape.
Downhill, which is exactly why we plan it. We keep the sediment slurry off downhill planting beds and out of the neighbor's yard, work in bands across the slope instead of letting one sheet run the whole grade, and rinse toward the street rather than into landscaping. On lots with a retaining wall below the drive, we route around the wall so silt does not pack into the drainage behind it.
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