House Washing and Soft Washing
Two names for the same job. Here is what it actually involves, why high pressure is the wrong tool for a wall, and why one side of your house is always worse than the others.
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House washing is soft washing. They are the same thing.
People search for both, and there is no meaningful difference in what gets done. House washing means cleaning the exterior walls of a home, and on almost every wall surface the correct method is soft washing — low pressure plus a cleaning solution that kills the growth, rather than high pressure that blasts it off.
The distinction that actually matters is not the name. It is pressure versus solution, and which surfaces can take which.
Why high pressure is wrong for walls
Concrete is a solid slab that can take a beating. A wall is an assembly — panels, joints, seals, flashing, and behind it a cavity that is supposed to stay dry.
- Vinyl siding overlaps. Water driven upward under the laps goes behind the panel and has no easy way out.
- Stucco is porous and its finish coat is thin. Too much pressure takes the finish off in patches that then need matching.
- Brick is tough, but the mortar between it is not, and aged mortar joints wash out.
- Painted wood is the least forgiving of all. Pressure that vinyl shrugs off will peel paint in sheets.
The tell when this has been done badly is not damage you see on the day. It is a stain that comes back within weeks, because blasting removes what is visible and leaves what is rooted, or a patch of siding that starts showing water marks from the inside months later.
What a soft wash actually involves
| Step | What happens |
|---|---|
| Protect | Beds and shrubs wetted down, sensitive items covered, outlets and fixtures checked |
| Apply | Cleaning solution at low pressure, worked from the bottom up to avoid streaking |
| Dwell | Time for the solution to kill the growth. Rushing this is why some washes do not last |
| Rinse | Top down at low pressure, then the landscaping rinsed thoroughly |
Why one wall is always worse
Most houses have one wall that looks years older than the rest. It is almost always the north-facing one, because it gets the least direct sun and therefore stays damp longest after rain or dew. Add humidity and that is ideal for algae.
The same logic explains the shaded end of a fence, the strip of driveway under a tree, and the roof slope facing away from the afternoon sun. It is a moisture problem, not a dirt problem, which is why rinsing with a hose achieves nothing.
How often
In a humid climate a good soft wash typically holds for a year or two. Heavily shaded houses need it more often, and houses with poor drainage around the foundation need it most of all — if water sits against a wall, that wall will keep going green regardless of how well it was cleaned.
What to ask
- Are you soft washing or pressure washing the walls? Soft washing, and they should not have to think about it.
- What happens to my plants? Wetted before, rinsed after. If that is not the answer, expect to lose some.
- Are windows and screens included? Often extra, and often worth it while the crew is set up.
- Is the soffit and fascia included? This is a common gap between quotes.