Key takeaways
- Pressure washing uses high water pressure and suits hard surfaces like concrete.
- Soft washing uses low pressure with a cleaning solution and suits siding, stucco, painted surfaces and roofs.
- The wrong method can etch concrete, strip paint, force water behind siding or damage shingles.
- In most California cities, wash water is not allowed to run into storm drains. Ask how it will be handled.
What is the difference?
Pressure washing relies on the force of the water to remove dirt, grime, gum and stains. It works well on durable, hard surfaces.
Soft washing uses much lower pressure and relies on a cleaning solution to break down dirt, mildew and algae, which is then rinsed away. It is used on surfaces that high pressure could damage.
Which method for which surface
| Surface | Usual method | Why |
|---|---|---|
| Concrete sidewalks and driveways | Pressure washing | Durable and holds embedded dirt and stains |
| Pavers | Pressure washing at lower pressure | Too much pressure can wash out joint sand |
| Stucco | Soft washing | High pressure can crack or gouge the surface |
| Vinyl and fiber cement siding | Soft washing | High pressure can force water behind the siding |
| Painted wood | Soft washing | High pressure can strip paint |
| Asphalt shingle roofs | Soft washing | High pressure can remove granules and shorten roof life |
| Wood decks and fences | Low pressure | High pressure can raise and splinter the wood fibers |
| Dumpster pads and drive-thrus | Pressure washing with degreaser | Grease and buildup need both force and chemistry |
| Fabric awnings | Soft washing | Fabric and seams can tear under pressure |
How often in the Sacramento area
Long, dry Sacramento Valley summers leave dust and pollen on siding, windows and concrete. After wet winters, shaded walls, fences and north-facing roofs are where mildew and algae show up first. Many homeowners wash exteriors once a year, and many businesses clean entries and sidewalks more often because customers walk on them every day.
What about runoff?
California stormwater rules generally prohibit anything other than rainwater from entering storm drains, and many cities enforce this for wash water, especially from commercial properties. Before hiring anyone, ask how wash water and debris will be handled on your site.
Commercial exterior cleaning
Businesses usually clean exteriors more often than homes, because customers see and walk on these areas every day:
- Sidewalks and entries: gum, spills and the grey film from foot traffic.
- Dumpster pads and drive-thrus: grease and buildup that draw complaints and pests.
- Parking garages and stairwells: oil, dirt and debris on decks and landings.
- Storefronts, awnings and canopies: the first thing a customer sees.
- Graffiti: removal matched to the surface underneath.
Commercial exterior work is usually scheduled early, late or on weekends to stay clear of customers and cars.
Common damage to avoid
- Stripes or etching in concrete from a nozzle held too close.
- Water forced into window frames, door frames and light fixtures.
- Paint lifting on older or poorly bonded paint.
- Streaks on oxidized siding.
- Plants harmed by cleaning solution. Landscaping near the work area should be wetted and rinsed or covered.
Doing it yourself vs hiring
Rental pressure washers work for many driveways and patios if you keep the nozzle moving and at a safe distance. Siding, stucco and roofs are where do-it-yourself jobs most often go wrong, because they need low pressure, the right cleaning solution and, for roofs and second stories, safe ladder or roof work. If you are not sure which method a surface needs, get it looked at before you start.
Before you book
- List every surface you want cleaned
- Note any damage, loose siding or cracked stucco first
- Move vehicles, planters and furniture out of the way
- Close windows and doors
- Point out outdoor outlets and fixtures
Opora Services matches the method to each surface for homes and commercial properties. Request a quote.
Common questions
Is soft washing as effective as pressure washing?
On the right surfaces, yes. Soft washing lets the cleaning solution do the work, which is why it is used on siding, stucco and roofs where pressure could cause damage.
Can pressure washing damage concrete?
Too much pressure held too close can etch or scar concrete. The right nozzle, distance and pressure matter.
Will soft washing hurt my plants?
Cleaning solutions can affect plants, so landscaping near the work area should be wetted and rinsed or covered. Ask how plants will be protected before work starts.
Can pressure washing remove oil stains?
It can lighten or remove many oil stains on concrete, usually with a degreaser. Old, deep stains may not come out completely.
How often should a house be washed?
Many homes are washed about once a year. Shaded, damp or dusty areas may need it more often.
Written by Opora Services in Sacramento, California. Last updated September 2026.
