Soft Wash vs Pressure Washing: Which Surfaces Take Pressure

The Short Answer: Force for Flatwork, Chemistry for Siding

Pressure washing and soft washing are not two brands of the same service. Pressure washing removes material with force, roughly 2,000 to 4,000 PSI through a narrow fan, and that force is what does the cleaning. Soft washing runs water at about garden-hose pressure, under 500 PSI at the tip, and lets a cleaning solution work over a dwell time of several minutes before a low-pressure rinse. The rule that covers most houses: pressure belongs on flatwork and masonry, chemistry belongs on anything with a seam, a lap joint, or paint. Concrete does not care about 3,000 PSI. Vinyl siding cares a great deal, because vinyl is not a sealed surface, it is a shingled one, hung in overlapping courses built to shed water downward. Anything that drives water upward and behind those courses is working against how the wall was designed.

How Pressure Damages Siding, Usually Where You Cannot See It

The damage people picture is cosmetic, and cosmetic is the mild version. A narrow tip held too close gouges cedar and furs the grain. Old vinyl that has chalked in the sun cleans unevenly under pressure, because the oxidized layer strips in patches and leaves a blotched wall that looks worse than the dirt did. Stucco loses its finish coat. On EIFS, which is a thin synthetic coat over foam board, a careless pass punches straight through to the foam. Those you notice the same day. The expensive failure is quieter. Water forced up under a lap joint, past a window flange, or into a soffit vent lands inside the wall assembly, on sheathing and insulation that were never meant to get wet and have no path to dry out. It surfaces eight months later as a musty smell, a stained ceiling corner, or mold behind drywall, and by then nobody connects it to the wash.

Surface by Surface: What Takes Pressure and What Does Not

Takes pressure: concrete driveways, sidewalks, patios, and pool decks, ideally with a rotating surface cleaner rather than a wand so you do not leave zebra striping. Unpainted brick and block in sound condition, though crumbling mortar will not survive it. Steel, stone retaining walls, dumpster pads, commercial flatwork. Needs a soft wash: vinyl, aluminum, wood, cedar shake, LP and composite siding, fiber cement, stucco, EIFS, painted anything, soffits, fascia, gutter exteriors, and screens. Leave to a specialist: asphalt shingle roofs, where pressure strips the granules that are the shingle's UV protection, and most manufacturers void the warranty over it. Judgment calls: pavers, where pressure blows out the joint sand you then have to replace, and older wood decks, which can take low pressure and a wide tip in a careful hand. When you are unsure, the test that works is whether the surface has a seam water could get behind.

Why a Pressure-Washed House Gets Dirty Again Faster

The green and black film on a north-facing wall is not dirt. It is living, mostly algae with some mildew, and it has a root structure sitting below the layer you can see. Pressure removes the visible growth and leaves the roots, which is why a pressure-washed wall often looks clean for six weeks and then hazes back over while the sunny side stays fine. A soft wash solution kills the organism instead of blasting off its top layer, so the wall holds clean substantially longer from the same visit. That is the part rarely mentioned when two prices are sitting side by side: on siding, the higher-pressure option is both the riskier one and the shorter-lived one. No tradeoff is being made. Pressure on a house is not a stronger clean, it is a worse clean delivered harder.

Six Questions That Predict Whether a Quote Will Damage Your House

These work on any company, including this one. One: what pressure will be at the surface, not at the pump? A real answer names a range and a tip size. Two: what is the plan for stucco or EIFS, and does the estimator know the difference? Three: will they run a test patch on an inconspicuous wall first? Four: how do plants get handled, pre-wet and rinsed after, or ignored? Five: what is the dwell time before rinse, since a solution sprayed and immediately blasted off never got to work? Six: will they email a certificate of insurance? Add one more if the house predates 1978, because disturbing lead paint is a regulated issue and a contractor who has never heard of it should not be washing your painted wood. Vague answers on pressure and dwell time are the two that most reliably precede damage.

What Reflekt Charges, and When to Call Someone Else

Reflekt Window Cleaning runs both services, which is the only reason this page can be even-handed. House washing is soft wash at $0.18 per square foot. Pressure washing is $0.20 per square foot and goes on driveways, patios, sidewalks, and flatwork. Selling both means there is nothing to gain by aiming the wrong one at your siding. Where Reflekt is behind: founded in April 2025 by Hunter Stevens and Ethan Seusy, so several valley companies have years on us and a much longer review history. We hold 4.9 stars across 115+ Google reviews, fully insured and locally owned. Where to call someone else: Reflekt does not clean roofs, so an algae-streaked asphalt roof needs a roof cleaning specialist. And a 200 square foot patio is a rental machine and one afternoon if you own a hose. For siding, flatwork, gutters, and windows across the valley, call (208) 453-6760.