There's no single right way to clean an exterior — the right method depends on the surface. Hard, nonporous materials like concrete can take pressure; softer or water-sensitive surfaces like siding and roofs need soft washing instead.
The one rule that decides the method
The choice comes down to a single question: can this surface safely take pressurized water? If yes, pressure washing is an option. If the surface is soft, porous, painted, or prone to water intrusion, soft washing is the safer choice.
Pressure is measured in psi (pounds per square inch). Most residential pressure washers run 2,000–3,000 psi at the pump. That's enough to etch concrete if held too close, and far too much for siding, roofing, or wood. Soft washing, by contrast, applies solution at pressures comparable to a garden hose.
Surfaces that need pressure washing
Hard, nonporous surfaces that can withstand direct spray:
- Concrete driveways and garage aprons.
- Concrete or brick walkways and patios.
- Paver surfaces with solid joints.
- Metal fencing and railings.
- Heavy-duty masonry walls.
These surfaces hold up to a wide-fan spray and benefit from the mechanical force that lifts ground-in dirt and salt. Even here, the right tip and distance matter — a narrow tip held close can damage any of them.
Surfaces that need soft washing
Surfaces that are soft, painted, or water-sensitive:
- Vinyl, aluminum, and stucco siding.
- Asphalt and fiberglass shingle roofs.
- Wood decks, fences, and pergolas.
- Stucco and EIFS (synthetic stucco) walls.
- Screens, awnings, and outdoor fabrics.
These surfaces need a cleaning solution to do the work, applied at low pressure. Forcing water into siding laps, under shingle tabs, or into wood grain causes damage that doesn't show up until later.
Surfaces that need both
Some projects genuinely call for both methods on the same property. A full exterior clean might pressure wash the driveway and walkway, soft wash the siding and roof, and use a gentler rinse on the deck. That's normal — the surface decides the method, not the job.
For a concrete patio with a sealed surface, a low-pressure rinse may be enough. For a paver walkway with moss in the joints, a targeted pressure pass followed by a treatment works well. Our surface cleaning in Avon Lake, Ohio page covers how we mix methods on a single property.
A quick reference for Ohio homes
- Driveway and garage apron: pressure washing.
- Concrete walkway or patio: pressure washing, wide-fan tip.
- Vinyl or stucco siding: soft washing.
- Asphalt shingle roof: soft washing, never pressure.
- Wood deck: soft wash to clean, low-pressure rinse, then seal.
- Paver walkway: pressure with care, or soft wash for delicate stone.
When in doubt, default to the gentler method. It's easier to clean a surface a second time than to repair pressure damage.
If you're planning a project, our pressure washing and soft washing pages break down what each method covers and where we use them.