Soft Washing in Fresno California

The question worth asking any exterior cleaner is simple: what pressure are you putting on my stucco? If the answer is whatever the machine does, keep calling. Stucco, siding, painted wood and roofing all have a threshold, and past it you are not cleaning the surface, you are removing part of it.

The second question is just as useful: how long are you letting it sit? Soft washing works on dwell time, not force. The solution has to stay wet on the wall long enough to kill the growth in the pores. In 100 degree Fresno afternoon heat on a west wall, it can flash off before it has done anything, which is why we work shaded elevations in the afternoon and re-wet a section instead of walking away from it. A crew that sprays and immediately rinses is bleaching the color out of the algae, not killing it, and you will watch it come back in the same pattern.

We quote on the real variables: square footage and stories, what the surface is made of, how much organic growth is on it, how much of the house faces north, whether there is a working hose bib with real flow, and whether the roof and eaves are coming along on the same visit. Then you get one number, in writing, before we start.

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They are living organisms, algae, mildew and mold, not dirt. That is why scrubbing and rinsing never fully works and why they always return in the same places.

The green film is usually algae. The black or gray streaking is typically mildew and mold colonies, and the dark, powdery deposits under eaves and in corners are the same family. The black streaks people see running down a roof are a specific one, a hardy blue-green algae called Gloeocapsa magma, which is why roof streaks look different from wall growth and why they always start on the shaded slope. All of them need three things: moisture, shade and something organic to feed on. A north-facing Valley wall in December supplies all three generously.

That is also why the north side of a house looks like a different building from the south side. The south and west elevations get baked dry by early afternoon almost every day of the year here. The north elevation never does. It stays cool, it holds the morning damp, and from November through February the tule fog keeps it wet for days at a stretch. Growth does not spread evenly and then get scrubbed off unevenly. It only ever grows where it can stay wet.

Fresno gives them a specific seasonal cycle. Tule fog holds moisture against walls for weeks at a time in winter, and irrigation overspray keeps the lower few feet damp year-round. Ag dust and pollen settle on the wall and become the food source. Then summer bakes the whole colony into the surface, which is why a wall neglected through August is significantly harder to bring back than one cleaned in spring.

Location tells you what you are dealing with. Streaking that runs vertically below a gutter joint is usually a leak feeding growth. Growth concentrated in the bottom three feet is almost always sprinkler overspray. A uniformly dark north elevation with a clean south elevation is the classic shade-and-fog pattern, and it is the single most common call we get.

Left alone it does more than look bad. Organic growth holds moisture against the finish coat, and moisture in stucco eventually means efflorescence, spalling and paint failure. On siding it works into seams. It is also an allergen sitting on the wall right outside the windows you open in spring.

The treatment is straightforward when the method is right: a surface-appropriate solution applied at low pressure, given real dwell time to kill the organism rather than just bleach the color out of it, then rinsed. Fixing the cause matters too, so we will point out the leaking gutter joint or the sprinkler head aimed at your wall, because otherwise the growth is back before the next fog season ends.

Two honest limits. First, not every mark on a wall is alive. Chalky white deposits on stucco are usually efflorescence, minerals coming out of the wall itself, and no amount of cleaning solution stops that from returning until the moisture source behind it is fixed. Second, a wall that is simply dusty from an August of ag traffic does not need a chemical wash at all. A rinse gets it, and we will say so rather than sell you a treatment the wall does not need.

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We soft wash homes, roofs and commercial exteriors across Fresno and the wider Central Valley.

Fresno is where most of our soft washing happens, and the pattern here is consistent: stucco everywhere, hard water in every sprinkler line, ag dust year-round and tule fog every winter. Most calls start the same way, my siding looks dirty, or there is green stuff on my roof and it is only on one side. The older neighborhoods with mature trees hold growth on shaded elevations far longer, while newer developments in northwest Fresno and Clovis get more sun-baked dust film and hard-water spotting on the lower few feet of wall where the sprinklers reach.

The same conditions run right through Madera, Visalia, Hanford, Tulare and Merced, so the method travels. What changes is the mix, foothill towns like Oakhurst see more moss and shade growth, while the dairy and ag corridors get heavier airborne dust loading.