Soft Washing vs. Pressure Washing: What Frankfort Homeowners Need to Know

Most homeowners use pressure washing as a catch all term for anything involving a hose and a machine. In the trade they are two different jobs with two different tools, and picking the wrong one is how people end up with water inside their walls, stripes burned into their driveway, or a ten year old roof that suddenly looks twenty.

We clean homes across Frankfort every week, from the brick and stone on the older Prestwick streets to the vinyl in Brookside Glen and Lakota Ridge. The single most common thing we get called to fix is damage from the wrong method, usually done by a homeowner with a rental machine or by a company that owns one piece of equipment and uses it on everything.

Here is the plain version of what separates the two, which surfaces need which, and how to tell if the company quoting your house actually knows the difference.

What Pressure Washing Actually Is

Pressure washing cleans with mechanical force. A pump pushes water through a narrow tip at high pressure, and the impact of that water knocks dirt loose. The two numbers that matter are PSI, which is the force, and GPM, which is how much water is moving. Contractor machines commonly run somewhere in the 3,000 to 4,000 PSI range at four or more gallons per minute. A big box store rental usually runs less pressure and far less water, which is why rentals take four times as long and still leave streaks.

Done correctly on the right surface, pressure washing is excellent. We run a rotating surface cleaner on concrete, which keeps the pressure even across the whole slab instead of leaving the wand marks that create that zebra striped look. Force is the right answer when the material is hard, the dirt is embedded, and the surface can take the hit.

Force is the wrong answer when the material is soft, porous, sealed, or has a coating you cannot put back. That is most of the outside of your house.

What Soft Washing Actually Is

Soft washing cleans with chemistry instead of force. The solution goes on at roughly garden hose pressure, usually around 100 PSI or less, sits on the surface long enough to work, and then gets rinsed. There is no impact on the material at all.

The important difference is not gentleness, it is what gets removed. Most of what makes a house look dirty in northern Illinois is not dirt. It is living growth. Algae, mildew, mold, and lichen colonize siding and roofs and hold on with root structures that reach into the surface. High pressure blasts the visible top layer off and leaves the roots behind, so the house looks clean for a season and then greens up again. A soft wash solution kills the organism at the root, which is why a properly soft washed house stays clean for one to two years instead of three months.

Soft washing is also the only method that will not force water behind vinyl siding, into window seals, under shingle courses, or into the mortar joints of an older brick home.

Which Method Each Surface Needs

This is the breakdown we use on every Frankfort estimate.

Soft wash only:

• Vinyl siding. The manufacturer recommended method. High pressure drives water up behind the laps and into the sheathing, and it can crack or melt vinyl outright on a hot day.
• Asphalt shingle roofs. Pressure strips the granules that protect the shingle from UV, and it commonly voids the shingle warranty. See our roof cleaning page for how we handle these.
• Painted wood, cedar, and LP siding. Pressure lifts paint and raises the wood grain, which leaves a fuzzy surface that holds dirt worse than before.
• Stucco and dryvit. Easy to gouge, expensive to patch, and almost impossible to match.
• Older brick with soft mortar. Common on the historic streets near downtown Frankfort. Pressure erodes the joints and the damage does not show up until water starts moving through the wall.
• Composite and PVC decking. Manufacturers of Trex and similar products specifically limit pressure. Force scars the cap layer permanently.
• Screens, shutters, soffit, and fascia. All thin, all easy to blow out.

Pressure washing is appropriate:

• Concrete driveways, sidewalks, and garage aprons. Best done with a surface cleaner rather than a wand.
• Concrete and brick patios. Depending on age and condition.
• Paver walkways and driveways. At controlled pressure so joint sand is not blown out, with re sanding after.
• Retaining walls, curbs, and steps.
• Dumpster pads, drive throughs, and loading areas on the commercial side.

Usually a combination:

• Concrete with heavy organic growth. We pre treat with a soft wash solution so the growth releases, then run the surface cleaner. This is why our concrete stays clean longer than a straight blast job.
• Wood decks and fences. Chemical cleaning to lift the graying and mildew, with very low controlled pressure to rinse.
• Gutter exteriors. The black vertical streaks on gutter faces are oxidation and road film. Pressure does nothing to them. They need a specific gutter brightener applied by hand.

What the Wrong Method Actually Costs

These are jobs we have personally been called out to look at in Will and Kankakee County.

Water behind vinyl siding. A homeowner runs a rental machine upward under the laps. Water gets into the wall cavity, and nobody knows until there is a musty smell or a soft spot in the drywall months later. Siding removal, insulation replacement, and drywall repair are all more expensive than a professional house wash.

Blown window and door seals. A high pressure tip held close to a window frame can push past the seal. Failed insulated glass shows up as permanent fog between the panes and the fix is a new sash.

Granule loss on shingles. Piles of black grit at the downspouts after someone pressure washed a roof. Those granules are the roof's UV protection and they do not grow back. It is a quiet way to take years off a roof, and it is worth reading about alongside how insurance carriers are now flagging roof condition from aerial photos.

Striping on concrete. Wand marks left by cleaning a slab without a surface cleaner. Every pass shows as a stripe, and the only real fix is to redo the whole slab correctly.

Furred wood. Pressure raises the grain on cedar fences and deck boards. The surface turns fuzzy, absorbs water faster, and needs sanding before it can be stained.

Every one of those costs more than the price difference between a company that owns the right equipment and one that does not. Our Frankfort pricing guide lays out what the work should actually run.

Where Power Washing Fits In

Power washing is the third term people use, and technically it means pressure washing with heated water. Heat helps on grease, gum, oil, and food traffic, which is why it matters far more on restaurant pads and drive throughs than on a house. For residential work in Frankfort, the meaningful choice is almost always soft wash versus pressure, not hot versus cold. If a company talks about heat on a vinyl house wash, they are selling a feature that does not apply to the job.

Why This Matters More in Frankfort Than You Might Think

Frankfort's mature tree canopy is a genuine asset and also a genuine cleaning problem. Shade keeps siding and roof slopes damp long after a rain, and damp shaded surfaces are where algae and mildew establish first. That growth is a chemistry problem, not a force problem, which is why so many Frankfort homes look worse a few months after a pressure only wash.

The housing stock adds a second wrinkle. Newer subdivisions run heavily to vinyl and manufactured stone, both of which are soft wash surfaces. The older sections near downtown carry brick with aging mortar, painted wood trim, and detail work that high pressure damages fast. A crew that treats every Frankfort address the same way is going to hurt somebody's house eventually.

Winter is the third factor. Road salt, freeze and thaw cycles, and months of snow sitting against foundations and north facing walls leave a film that a homeowner cannot see until spring. That salt film comes off with the right solution, not with more PSI.

If your subdivision sends maintenance letters, method matters there too, because a wash that greens back up in ninety days puts you right back in front of the board. We covered that in our post on HOA curb appeal standards in Frankfort subdivisions.

How We Decide on Your House

Before anything gets turned on, our crew walks the property and identifies every surface type on it. A typical Frankfort two story might have four or five: vinyl on the main elevations, manufactured stone on the front, painted wood on the trim and columns, a concrete driveway, a paver walkway, and an asphalt roof. Those are three different methods on one address.

Then we look at what is actually on the surface. Organic growth means chemistry. Traffic film, tire marks, and embedded grit on concrete mean a surface cleaner. Rust, oil, and paint are separate specialty treatments that neither method solves on its own.

Landscaping gets pre wet and rinsed on the way out, downspouts get managed so runoff does not pool in one bed, and we carry full general liability insurance on every job. Ask any company you are considering for a certificate of insurance and ask them specifically what method they plan to use on your siding. The answer tells you most of what you need to know.

You can see the full breakdown of services on the Frankfort exterior cleaning page, or go straight to house washing and pressure washing.

The Short Version

Pressure washing is for hard flat surfaces that can take force, mainly concrete. Soft washing is for everything attached to your house, because the problem there is living growth and the material will not survive the alternative. Most homes need both, applied in the right places, in the right order.

If you would rather stop thinking about which surfaces need what and when, our Clean Club members get the whole property scheduled out for the year at member pricing, with each surface handled the correct way on the correct interval.