Soft washing vs pressure washing: what is the difference?
Short answer: pressure washing cleans with water force and belongs on concrete. Soft washing cleans with a solution at low pressure and belongs on everything vertical, meaning siding, stucco, painted wood, and brick. Most homes need both, on different surfaces, in the same visit.
- The actual difference, in one paragraph
- A surface-by-surface table of which method to use
- What high pressure does to stucco, vinyl, and old mortar
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One does the work with water. The other does it with chemistry.
Pressure washing removes what is on a surface using the force of the water. That is the right tool for concrete, because concrete is hard, non-porous enough to take it, and what is stuck to it is largely mechanical: grit, road film, tire marks, and staining that has soaked in.
\nSoft washing removes what is on a surface using a cleaning solution with time to work, then rinses at pressure not much above a garden hose. That is the right tool for anything vertical, because what grows on siding is alive. Algae, mildew, and lichen are organisms, and force only removes their colour. The solution kills them at the root, which is why a soft-washed wall stays clean for a year and a pressure-washed one goes green again in weeks.
\nThis is the single most useful thing to understand before you hire anyone: if a company describes their entire service as pressure washing and quotes one pressure setting for your whole property, they are going to use the wrong method on most of it.
\nQuick rule
\n- \n
- Flat and hard and horizontal → pressure washing \n
- Vertical, painted, or porous → soft washing \n
- Living growth (green, black, lichen) → always solution \n
- Historic masonry → soft washing only, never a wand \n
- Unsure → soft wash, because it cannot damage what pressure can \n
Which method each part of your property needs
Vinyl siding → soft wash
Pressure forces water up behind the lap joints and into the wall cavity, and it strips the oxidized surface layer unevenly so the wall ends up blotchy. Soft washing is the manufacturer-aligned method.
Stucco and EIFS → soft wash
Stucco pits under a close-range wand and the damage is permanent. EIFS is worse: it is foam behind a thin coat, and water driven through it does not dry out.
Painted wood → soft wash
Pressure lifts paint at every edge and seam, and on older homes it finds the failing caulk you did not know about. Low pressure plus solution does not.
Brick and historic mortar → soft wash
Old lime mortar washes straight out under pressure. Repointing a historic home costs many multiples of the wash. This is the one where getting it wrong is genuinely expensive.
Concrete driveways and walks → pressure wash
This is what pressure washing is for. Use a flat surface cleaner rather than a hand wand, or you get the alternating clean-and-dirty banding people call zebra striping.
Pavers → pressure wash, carefully
Pavers take pressure, but too much blows the polymeric sand out of the joints, and then the pavers shift. It is a controlled pass, not a blast.
Stamped and coloured concrete → between the two
The concrete can take pressure; the decorative sealer on top usually cannot. If the sealer has already failed, cleaning will make that obvious, which is worth knowing before rather than after.
Wood and composite decking → soft wash
Pressure raises the grain on wood and permanently furs the surface. Composite scars and the scars do not weather out.
Roofing → soft wash only
Pressure on asphalt shingles strips the granules that are the shingle\'s entire UV protection. There is no version of this that is acceptable.
What high pressure actually does
Water behind the siding
The most common and least visible failure. Water driven up under lap siding sits in the wall cavity, and you find out months later through a stain on the drywall or a soft spot in the sheathing.
Permanent surface damage
Pitted stucco, furred wood, scarred composite, and etched paint. None of these weather out; the only fix is refinishing the surface.
Blown mortar and joint sand
Washed-out mortar on historic masonry and displaced polymeric sand in paver joints. Both are structural, not cosmetic.
Growth that comes straight back
The quiet one. The wall looks clean, the algae was never killed, and it is visibly back within four to eight weeks. If that is your experience of pressure washing, this is why.
What a normal visit looks like on a Utah home
On a typical property here, the walls get soft washed and the flatwork gets pressure washed, in the same visit. The siding, stucco, soffits, and eaves take a solution and a low-pressure rinse. The driveway, walks, and patio take a flat surface cleaner. Windows are their own job, because hard-water mineral spotting is a different problem again and needs a mineral treatment rather than either method.
\nThat is the whole answer, and it is why we describe what we do as exterior cleaning rather than pressure washing. See house and soft washing for the wall side, driveway cleaning for the flatwork side, and window cleaning for the glass.
\n5.0 from 15 verified Google reviews
Real reviews from recent Dirt Gone Wash Co customers.
"Saya came to do my siding and back patio. He gave me a great deal! He was professional and reliable and had a great price compared to others I received. I highly recommend."
Carrie A. · Google review
"Saya came out and cleaned my trash bins and driveway, and I was really impressed with the results. He was honest from the start and explained that the oil stains on my driveway would need a hot water treatment to fully remove them."
Irma B. · Google review
"They do a very good job and I'm very impressed with their work. Super professional, 10/10 recommend!"
Tiana I. · Google review
Soft washing and pressure washing questions
Is soft washing better than pressure washing?
Will pressure washing damage my vinyl siding?
Can you pressure wash stucco?
What chemicals are used in soft washing?
Why did the green come back so fast after my last wash?
Do I need soft washing or pressure washing for my driveway?
Is soft washing safe for plants and landscaping?
Where we work
Dirt Gone Wash Co. is a service-area business covering the corridor from Salt Lake City through Davis County to Ogden. Pick your city for local pricing and conditions.
Not sure which your house needs?
Send a photo and we will tell you honestly, including if the answer is that it does not need cleaning yet.