These two get lumped together because they both involve a hose and a machine, but they’re doing different jobs — and using the wrong one on the wrong surface is how roofs and siding get damaged.
The core difference
Pressure washing relies on high water pressure alone — typically 1,300 to 3,100 PSI — to physically blast dirt, oil stains, and grime off hard, durable surfaces. It’s fast and effective on concrete, pavers, brick, and stone.
Soft washing uses low pressure (150-300 PSI) combined with a biodegradable cleaning solution that breaks down algae, moss, mold, and mildew at the root. The solution does the work; the water just rinses it away. That’s what makes it safe for surfaces that high pressure would damage — shingles, stucco, painted siding, and delicate trim.
Why you can’t just pressure wash everything
Roofing shingles aren’t designed to take a direct high-pressure blast — it can strip the protective granules right off, shortening the roof’s life instead of extending it. The same goes for older stucco and painted wood siding, where high pressure can force water behind the surface or strip paint. Soft washing’s low pressure avoids that, and because the cleaning solution kills organic growth at the root rather than just knocking it loose, the results also last longer than a pressure-only rinse — surface dirt comes back fast, but a proper soft wash keeps algae from regrowing for months.
Where each one is the right call
| Use pressure washing for | Use soft washing for |
|---|---|
| Driveways and walkways | Roofs (tile, shingle) |
| Concrete patios | Stucco and painted siding |
| Pavers and stone | Painted trim and delicate surfaces |
| Block walls and fences | Anywhere algae or mildew is the problem, not just dirt |
Most jobs need both
A typical exterior cleaning visit covers ground-level hard surfaces with pressure washing and everything above it — roof, siding — with a soft wash. Trying to do the whole house with one method either leaves the roof damaged or leaves the driveway still dirty, so most properties are quoted as a combination rather than one or the other.
See our pressure washing and soft washing pages for what each covers, or request a free quote and we’ll tell you which combination your property actually needs.