Last updated: September 2026
What is the cheapest soft wash system available?
The cheapest soft wash system that works on stucco is a 12-volt pump rated at 3 to 5 GPM, a battery, 50 feet of hose, and a sodium hypochlorite mix. Expect to spend $600 to $1,500. Anything under 3 GPM leaves streaks, and anything over 150 PSI at the wall risks the paint.
We built our first soft wash rig from parts, and it taught us where cheap stops working.
What does a budget setup cost compared with a pro rig?
| Setup | Flow | Cost | Fit for stucco |
|---|---|---|---|
| 12V pump and tank | 3 to 5 GPM | $600 to $1,500 | Single-story homes |
| Downstream injector on a pressure washer | Varies | $50 to $150 | Weak mix, uneven results |
| Truck-mounted pro rig | 8 to 12 GPM | $8,000 and up | Two-story and roofs |
The injector route looks like a bargain. It is not.
Why injectors disappoint on painted stucco
An injector pulls chemical at whatever ratio the tip and pressure allow, so the mix on the wall changes from one pass to the next. On a South Park Craftsman we saw a homeowner's injector job leave bands of clean and green stucco about 18 inches wide.
A dedicated pump fixes that because the mix stays constant. We run roughly 100 to 150 PSI at the wall and let the solution dwell for 10 to 15 minutes.
Is it cheaper to hire a crew than to build a system?
For one house, yes. A single-story soft wash in San Diego runs $250 to $500, so a $1,000 rig pays back only after three or four jobs. And that ignores runoff rules. Anything that drains to a storm inlet needs to be contained, which a home setup rarely handles.
Marine layer mornings in Kensington and North Park also change dwell time. Stucco stays damp until about 11 am, and the mix runs weaker on wet walls.
Our full pricing is on the soft washing cost page, and the process is on our soft washing service page.