You're standing in the yard, coffee in hand, and you notice it: the siding doesn't look as bright as it did a couple years ago. There's a greenish tint on the shaded side. Some dark streaks near the gutters. The house doesn't look bad — it just looks... older than it should.
The instinct is to grab a pressure washer and blast it clean. And honestly, that instinct makes sense — "pressure washing" is the term everyone uses for exterior cleaning. But here's what most homeowners don't realize: using high pressure on the wrong surface can actually damage your home.
There are two very different methods behind that one term, and knowing the difference is the key to getting your home clean without causing problems.
The Two Methods, Simply Put
Pressure Washing
High-pressure water — typically 1,500 to 4,000 PSI — designed to blast away stubborn staining from hard, durable surfaces. Think concrete driveways, brick, stone, and pavers. The force does the work.
Soft Washing (House Washing)
Low-pressure water — comparable to your garden hose — paired with specialized cleaning detergents that break down algae, mold, and grime at the source. The solution does the work, not the pressure. The surface gets gently rinsed afterward.
Same goal — a clean exterior. Very different approach.
Why Using the Wrong Pressure Causes Problems
High pressure on siding, roofing, or painted surfaces isn't just overkill. It can cause real, expensive damage:
- ▸Etching and scarring — high pressure can score vinyl, scar stucco, and strip paint, creating a rougher surface that collects dirt faster afterward
- ▸Water intrusion — this is the big one. Blasting siding forces water behind it, into wall cavities, around windows, and near electrical fixtures. That trapped moisture can lead to mold inside your walls
- ▸Voided warranties — many siding and roofing manufacturers specifically state that high-pressure washing voids their warranty
- ▸Damaged seals — window seals, caulking around doors, and weatherstripping can all get blown out by excessive pressure
The irony? Pressure washing your siding often makes it get dirty faster, because the etched surface gives grime more texture to hold onto.
What Surfaces Are Usually Soft Washed
If it's not concrete, brick, or stone, it almost certainly needs soft washing:
- ▸Vinyl siding
- ▸Stucco and Dryvit
- ▸Painted wood and Hardie board
- ▸Brick with mortar joints (especially older brick)
- ▸Roof shingles
- ▸Soffits and fascia
- ▸Aluminum siding
The detergent is applied, allowed to dwell and kill organic growth at the root, then gently rinsed. The result is a deeper clean that lasts longer than blasting — because the organism is dead, not just rinsed off.
What Surfaces Can Handle Stronger Cleaning
Hard, non-porous surfaces can take (and benefit from) higher pressure:
- ▸Concrete driveways and walkways
- ▸Pavers and exposed aggregate
- ▸Brick and stone (in good condition)
- ▸Metal fencing and railings
Even here, though, technique matters. That's why we use a flat surface cleaner on concrete rather than a wand — it delivers consistent pressure without the streaks and gouging a handheld wand causes.
The Texoma Climate Factor
In Sherman, Denison, and the surrounding area, our humidity and seasonal rainfall create ideal conditions for algae, mold, and mildew on siding. North-facing walls and shaded sides of the home are especially vulnerable. You'll often see dark green or black streaks forming — that's organic growth feeding on moisture and pollen that settles on the surface.
Soft washing kills that growth at the root. A pressure wash might rinse off the visible layer, but the organism stays — and it comes back within weeks. Soft washing typically keeps siding clean for 12 to 24 months.
The Takeaway
Not every surface needs max pressure. Your siding, roof, and painted surfaces need soft washing. Your driveway and walkways can handle controlled pressure. When both are done right — with the right equipment and the right technique — your whole property gets clean and stays that way.
If your home's exterior is looking dull, streaky, or weathered, Texoma Pressure Washing can help. We provide professional house washing and exterior cleaning throughout Sherman, Denison, and the surrounding Texoma area. Request a free quote and we'll match the right method to every surface on your home.
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House Washing
Deep clean your siding and exterior surfaces using advanced soft washing technology for safe, effective results.
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