Ask three neighbors what 'power washing' means and you'll get three different answers. In reality, professional exterior cleaning splits into two distinct methods — pressure washing and soft washing — and using the right one for each surface is the difference between a property that looks restored and one that's been visibly damaged. Here's how they differ and how we decide which to use.
Pressure washing: force does the work
Pressure washing uses high-pressure water to physically blast dirt, algae, and grime off hard, durable surfaces. It's the right tool for concrete driveways and sidewalks, pavers, brick, and stone — materials that can take direct force without damage. For heavy grease and oil, adding heat takes it further: hot-water pressure washing dissolves what cold water just pushes around, which is why gas stations and restaurant pads need it.
Soft washing: chemistry does the work
Soft washing flips the equation. Instead of force, it applies specialized cleaning solutions at low pressure — closer to a garden hose than a cutting jet. The solution breaks down algae, mildew, and dirt at the root, then rinses away gently. It's the correct method for painted siding, stucco, wood fences and decks, roofs, and any delicate or coated surface. Because it kills organic growth rather than just blasting off the visible layer, soft-washed surfaces also tend to stay clean longer.
Which method for which surface
- Concrete driveways, sidewalks & patios — pressure washing, ideally with a surface cleaner for an even finish.
- Painted or vinyl siding — soft washing; high pressure strips paint and forces water behind the panels.
- Stucco — soft washing; direct pressure gouges and 'spiderwebs' the finish.
- Wood decks & fences — low-pressure washing with wood-safe cleaners; high pressure fuzzes and splinters the grain.
- Brick & masonry — moderate pressure, lower on older mortar.
- Windows & solar panels — neither; these need purified-water cleaning with soft brushes.
What happens when you use the wrong one
Most of the damage we're asked to look at isn't from neglect — it's from a well-meaning wash with the wrong method. High pressure on stucco leaves permanent etch marks. On siding, it drives water behind the panels where it feeds mold. On wood, it carves stripes that only sanding removes. On the flip side, soft washing alone won't lift years of ground-in grime from concrete. The method has to match the material; that judgment is a large part of what you're hiring.
The short answer
Hard mineral surfaces get pressure. Everything painted, coated, organic, or delicate gets soft washing. Most Bay Area homes need both on the same visit — pressure for the driveway and walkways, soft wash for the siding and fence — and we quote it that way, matching the method to every surface on the property. If you're not sure what your surfaces need, send us a couple of photos and we'll tell you straight, with a free no-obligation quote.