The short answer
Which surfaces get which method
This is the exact split I use on every job. If a quote proposes pressure on the left column, keep shopping.
Soft wash only
Low pressure + chemistry
- ✓Roofs, tile and shingle
- ✓Stucco and painted block
- ✓Siding and soffits
- ✓Pool cages and screens
- ✓Wood fences and decks
- ✓Painted or coated surfaces
Pressure appropriate
Controlled mechanical cleaning
- ✓Concrete driveways and sidewalks (surface cleaner)
- ✓Paver surfaces (joints protected)
- ✓Curbs and gutters
- ✓Dumpster pads (hot water degreasing)
- ✓Unpainted masonry, case by case
Why "just blast it" fails twice
High pressure on the wrong surface fails immediately: cracked tile, furred wood, torn screens, etched concrete cream, paint chips in the flower bed. But it also fails slowly, because pressure only removes what it can reach. The organism survives in the pores and comes back within months. Chemistry kills the growth itself, which is why a proper soft wash stays clean several times longer than a blast job.
It is also why "do you use just water or cleaners" is one of the smartest questions you can ask any washing contractor. Water-only at high pressure is the signature of a guy with a rented machine. The answer you want to hear is the mix, matched to the surface, rinsed off the plants.
Straight answers
The questions I actually get, answered the way I answer them on the phone.
Is soft washing safe around kids, pets, and plants?
Yes, with proper handling. Plants get pre-wet and rinsed so the solution never dries on them, and I will tell you when treated surfaces are rinsed and ready. Keep pets off the work area during the job and everything is back to normal after the final rinse.
Does soft washing work on black roof streaks?
That is its signature use. The streaks are organic growth, and the soft wash solution kills it across the whole roof surface. See roof cleaning.
Why do some companies only pressure wash?
Soft washing takes different equipment, real chemistry knowledge, and more patience. A rented pressure washer takes a credit card. That gap is exactly where the damage stories come from.