Soft-wash vs. pressure wash: which one does your house need?

People call it "pressure washing" for everything — but the truth is, about half of what I do isn't really about pressure at all. It's about the right cleaning solution doing the work while low-pressure water rinses it off.

That's soft-washing. And on the wrong surface, using high pressure instead can chew up paint, force water behind siding, or leave streaks that show up worse than the grime you started with.

• Vinyl siding — high pressure warps it and pushes water behind it
• Painted wood — will strip paint and expose bare wood
• Brick with soft mortar — high pressure erodes the mortar joints
• Roof shingles — pressure straight-up destroys asphalt shingles
• Older stucco or EIFS — cracks and moisture damage risk

For all of those, I mix a cleaning solution (safe when rinsed properly), apply it low-pressure, let it dwell, then rinse. The chemistry does the work. That's how you get an even, streak-free finish.

• Concrete driveways and walkways — needs pressure to lift oil and tire marks
• Pavers and stamped concrete — pressure plus a surface cleaner for even results
• Fresh wood decks (with a wide fan tip and careful technique)
• Metal fencing and gutters — the tough exterior can take it

If someone quotes you a "pressure wash" for your vinyl siding without mentioning soft-wash or a cleaning solution, that's a red flag. You want the person who owns your equipment to understand which surface needs which method.

That's why I ask a few questions before I quote — is your siding vinyl or wood? How tall is the house? Are there mildew streaks in specific spots? — because it changes the whole approach.

If it grows, soft-wash it. If it's stained, pressure-wash it.

Living things — mildew, algae, moss — come off with cleaning solution. Non-living stains — oil, rust, tire marks — need pressure.

Both jobs can look the same to the homeowner, but they're two different tools. Getting them right is why the finish holds up.