PORTLAND, OR · OWNER-OPERATED
Soft Washing in Portland, OR
Portland's damp, shaded climate grows moss and algae on siding, especially on the north-facing walls that never fully dry out. Soft washing cleans those surfaces gently, using low pressure and the right cleaning solution rather than blasting away at the siding. Oxbow Painting offers soft washing as a standalone service and as the first step before an exterior repaint.
Why soft washing, not high pressure
A pressure washer turned up high can carve into wood siding, force water behind boards, and strip paint in ways you do not want. Soft washing uses low pressure paired with a cleaning solution that does the actual work, lifting dirt, mildew, moss, and algae so they rinse away without damaging the surface underneath.
That gentler approach is the right call for painted siding, cedar, and the trim details on older Portland homes. It cleans thoroughly while protecting the finish you already paid for.
House washing, siding cleaning, and paint prep
We soft wash whole-house exteriors to knock back the gray, green film that builds up on Portland siding, and we focus on the shaded north and east faces where moss and algae take the strongest hold. The result is a cleaner, brighter exterior that often looks years younger without any paint at all.
When a soft wash is the lead-in to a repaint, it does double duty. A clean, sound surface is what lets new paint bond and last, so every Oxbow exterior project starts with a wash. If you are not ready to repaint yet, a standalone soft wash is a good way to maintain the home and slow the growth in the meantime.
Tackling moss and algae on the shaded side
The north-facing walls, the spots under tree cover, and the lower courses near planting beds are where Portland homes get the worst buildup. We treat those areas so the growth is killed and cleaned rather than just knocked loose, which slows how quickly it returns. We keep our cleaning claims general and focus on a safe, effective result for your siding and landscaping.
What it costs: From $350
House washing starts around $350 for a smaller single-story home and scales with square footage, story count, and how heavy the growth is. Prep-for-paint washing is included in the price of an exterior repaint. You get a written estimate before we start.
The Oxbow process
Estimate
We look at the exterior, note the growth and surfaces, and send a written estimate.
Protect
We rinse and protect plantings and sensitive areas before applying any solution.
Soft wash
Low-pressure application of cleaning solution lifts dirt, mildew, moss, and algae.
Rinse and check
We rinse the surface clean and walk the exterior with you.
Products we use
- Low-pressure soft wash equipment that protects siding and trim
- Cleaning solutions suited to mildew, moss, and algae on home exteriors
- Plant and landscape protection during the wash
- Prep-for-paint washing built into every exterior repaint
Who it is for
- Homeowners with green or gray buildup on siding, especially on shaded walls
- Anyone planning an exterior repaint who needs a clean surface first
- Owners maintaining curb appeal between paint cycles
- Homes under tree cover or near planting beds prone to moss and algae
Recent work
Get your soft washing estimate
Frequently asked questions
How much does house washing cost in Portland?
Soft washing in Portland starts around $350 for a smaller single-story home and increases with square footage, story count, and how heavy the moss and algae buildup is. When washing is the first step of an exterior repaint, it is included in the repaint price.
What is the difference between soft washing and pressure washing?
Soft washing uses low pressure plus a cleaning solution to lift dirt, mildew, moss, and algae, while pressure washing relies on high-force water. Soft washing is safer for painted siding, cedar, and older trim because high pressure can damage wood and force water behind the boards.
Will soft washing remove moss and algae from my siding?
Yes. Soft washing is designed to clean the moss, algae, and mildew that build up on Portland siding, especially on shaded north-facing walls. Treating the growth rather than just blasting it loose also slows how quickly it returns.
Do I need to wash my house before painting it?
Yes. A clean, sound surface is what lets new paint bond and last, which is why every Oxbow exterior repaint begins with a wash. Painting over dirt, chalk, and mildew is a common cause of early paint failure.