Soft washing vs pressure washing in Florida, and why the dark growth comes back
Hard concrete can take pressure. Painted and textured walls need a gentler wash. Here’s which surface gets which, and why the green and black keep returning to driveways, walks and walls around here.
By Pinewood Property Services · Updated
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The surface picks the method.
Pressure washing uses the force of the water to lift dirt and growth. It suits hard surfaces like concrete driveways, walks and patios.
Soft washing turns that around. A cleaning solution does the work, and a low-pressure rinse carries it away. It’s the gentler choice for stucco and painted walls, where the material sets the limit.
The growth comes back either way if the conditions that fed it don’t change. Anything that keeps a surface damp, like pooled rain or a sprinkler that hits the pavement, gives it the moisture it needs.
It may be growth, not dirt.
That dark film may not be dirt at all. Sto, which makes stucco finishes, describes algae as usually green stains and mildew as generally black stains that look like dirt.
Mold spreads by tiny spores. A UF/IFAS Extension fact sheet on preventing mold indoors says those spores float in outdoor and indoor air almost all the time. To grow, they need three things: moisture, nutrients and warmth. It also notes that Florida has more mold problems than cooler, drier states.
Nutrients aren’t hard to find, either. The same fact sheet says clean tile and glossy paint don’t support mold, but the slightest film of soil on them supplies what it needs.
Then there’s the weather. The National Weather Service dates the rainy season here from about May 25 to October 10. It brings frequent showers and thunderstorms, and dew points that stay above 70°F.
Force on one side, a solution on the other.
The familiar one is pressure washing. On a hard, sound surface, the spray does most of the work, lifting the grime and the film of growth.
With soft washing, the cleaning solution leads instead. It’s applied, left to work, and rinsed off gently. Sto’s cleaning steps for its stucco finishes follow that pattern: spray or brush on the solution, let it soak, then rinse with clean water.
Sto is also clear about the risk. It warns that high-pressure washing can destroy the surface of its acrylic finishes. That’s why the material comes first, and walls get a method and pressure matched to what they’re made of.
So we don’t use one approach everywhere. We look at each surface, its condition and what’s around it, then agree the work with you before we start.
Bleach makers point the same way. Clorox says a bleach and water solution can clean algae and mold from sealed, non-porous exterior surfaces such as stucco, painted wood, siding, tile, brick and patio stone.
Around a Florida home or business.
We wash driveways, walkways, patios, entries and exterior walls for homes, rentals and businesses. Each one gets a look before we agree on the method, so this is the usual pattern, not a rule. Know what you’ve got? Our quote tool takes the address and a few details, and photos help.
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Driveways and walkways
Sound concrete usually takes pressure washing. It’s a hard surface that can stand up to the force of the water.
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Patios and entries
Often pressure washed too, depending on the surface and its condition. Plants, fixtures and finishes right beside them shape how the work is done.
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Stucco and painted walls
Usually soft washing, with the method and pressure matched to the material. Sto warns that high pressure can destroy the surface of its stucco finishes, so a wall isn’t treated like a driveway.
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Roofs
We don’t wash roofs, or any surface that can’t take either method. When we look at the property, we’ll tell you which method, if either, is right for each surface.
Clean today, green again later.
Removing what you can see isn’t the same as killing it. Sto’s guide makes the point for its finishes: if bleach isn’t used, or isn’t given about 15 minutes to sit, algae or mildew will come back.
Even a thorough wash doesn’t change the conditions, though. The spores are still in the air, and the UF/IFAS fact sheet calls moisture control the key to mold control, since spores can’t grow without water.
Look at where the water comes from. Rain that runs off and pools in a corner keeps that spot wet long after the rest has dried.
Sprinklers are worth a look. UF/IFAS’s Florida-Friendly Landscaping program advises adjusting the heads so they don’t water sidewalks, streets or driveways. That saves water, and it’s one less soaking for the concrete.
It depends on the spot, not the calendar.
There’s no set interval that suits every property. How soon the dark film returns depends on how long the surface stays wet, and what keeps it that way.
Two parts of one property can differ for that reason. A walk beside a sprinkler zone, or a low corner where rain collects, gets more of the moisture growth needs than pavement left to dry.
If it’s back within weeks, find the water before booking another wash. Washing again without changing that only treats the symptom.
The best guide is your own property. Note where it comes back first, and how fast, and tell us when you ask for a quote.
What else to think about first.
Cleaning solutions and landscaping don’t mix well. Clorox’s patio guide says to water nearby plants first, rinse the surface thoroughly, then water any plants the solution reached again.
Storm drains are another matter. The City of Tampa says local ordinances make it illegal to put pollutants into the storm sewer. Pasco County’s land development code bars anything but stormwater from county storm sewers in unincorporated Pasco, apart from a list of exemptions. Sto tells anyone cleaning its finishes to check local rules on disposing of the solution and wash water.
Water and access matter on the day. We’ll ask whether there’s water on site we can use, and whether gates, parking or landscaping are in the way. You don’t need to be home, as long as we can reach the property.
Not every dark mark is growth, either. Rust, oil and other stains are a different problem. Washing isn’t a promise to remove them.
Start with what the surface can take.
Walk the property and note what needs cleaning: the drive, the walks, a patio or entry, the walls. Then note where the growth is worst, and whether pooled water or a sprinkler keeps it wet.
We price exterior washing from the surface, the area, its condition and access, and whether there’s water on site. We work it out from your answers and photos, or arrange a look if we need to see it first. You pay once the work’s done.
Tell us what needs washing.
Send the address and the surfaces you’d like cleaned, or call or text if that’s easier. You’ll hear back within one business day, and we’ll agree the date and final price with you.
Exterior washing covers the core and wider parts of our service area. More answers on property care are in our other guides.
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