Here’s the short version, and if you read nothing else, read this:
Pressure washing cleans with force. Soft washing cleans with chemistry. Hard surfaces want force. Your house does not.
What pressure washing is for
Pressure washing does exactly what it says — it fires water hard enough to physically blast grime out of a surface. On the right surface, that’s brilliant. Concrete is porous, dense and going nowhere, so dirt that’s worked its way into the surface needs real force to come back out.
That’s why a driveway is the most satisfying job in this whole trade. There’s no chemistry that’ll shift twenty years of embedded dirt out of concrete — it just needs pressure.
- Driveways
- Sidewalks and walkways
- Concrete and paver patios
- Retaining walls and hard masonry
What soft washing is for
Now here’s the part most people don’t know: the stains on your siding aren’t dirt.
Those gray-green streaks, the dark patches on the north wall, the film under the gutter line — that’s biological. Algae, mildew, mould, lichen. It’s alive, and it has roots into the surface.
This matters enormously, because you cannot solve a living problem with force. You can blast the surface growth off and the wall will look clean for a few weeks — but you left the roots, so it comes straight back, usually faster than before because you’ve just opened up the surface.
Soft washing uses low pressure — roughly garden-hose force — with a cleaning solution that kills the growth at the root. The wall gets treated, the growth dies, and it rinses away. It stays gone longer because you actually killed it rather than mowing it.
- Vinyl, wood and fiber cement siding
- Painted surfaces of any kind
- Soffits, fascia and gutters
- Decks and fences
- Roofs
What goes wrong when you get it backwards
This is the part worth understanding before you hire anyone, because it’s where the horror stories come from.
Siding is not a sealed surface. It’s a series of overlapping panels designed to shed water that runs down it. It was never designed to resist water being driven up and behind it at a few thousand PSI.
Point a pressure washer at it and here’s what you’re risking:
- Water behind the siding. The big one. It gets into the wall cavity, into insulation and sheathing, and it doesn’t dry. You won’t know for a year or two, and then it’s not a cleaning problem any more.
- Cracked or chipped vinyl. Especially vinyl that’s been through a decade of Kentucky and Tennessee summers and gone brittle.
- Furred-up wood. High pressure carves the soft grain out from between the hard rings and leaves the surface rough. It won’t take stain evenly afterwards.
- Stripped paint. Sometimes people call this a bonus. It isn’t — it strips unevenly, and now you have a repaint you didn’t budget for.
- Blown window seals and forced-out caulk. Both quiet, both expensive.
Nearly every “the guy who washed my house damaged my siding” story is this. It isn’t usually carelessness. It’s someone using the driveway tool on the house because they only own the one tool.
So which do you need?
Almost certainly both — just not on the same things.
A typical house here gets the siding, soffits and fascia soft washed, and the driveway, sidewalk and patio pressure washed. Same visit, same afternoon, different equipment and different pressure, chosen per surface.
That’s the whole answer. Anyone who tells you they’ll “pressure wash the whole property” either means soft washing and is being loose with the word, or means it literally. It’s worth one question to find out which.
One thing worth knowing if you’re painting
If a repaint is anywhere in your thinking, the wash isn’t optional. Paint over mildew is paint gripping mildew, and it will fail. A proper exterior job starts with a soft wash and a proper dry-out — which is also why anyone promising to wash and paint your house in the same day is telling you something useful about how the job will go.
Both, done right on the right surface, are what our pressure washing service is built around. Does pressure washing damage your home? goes deeper on what’s safe.
Questions about your own siding? Ask us — we’ll tell you what it needs even if the answer is “nothing yet.”