If you live in Hockessin or Greenville, you already know what Mid-Atlantic humidity does to a house. By late spring, north-facing walls are streaked green, vinyl siding feels slimy to the touch, and shaded brick corners look more gray than red. It is not just dirt. That film is a living mix of green algae, mildew, and airborne pollen that settled in during the wet months and started feeding on your siding. A garden hose will not touch it, and a high-pressure washer will force water behind panels and damage paint. The right answer is soft washing, and True Blue Pro Wash has been doing it in zip code 19707 and the surrounding Brandywine Valley communities for years.
Why Hockessin and Greenville Homes Get So Dirty So Fast
The wooded lots and mature tree canopy that make this part of New Castle County so attractive are also the reason exterior surfaces take a beating. Overhanging oaks and maples shade the siding for most of the day, so moisture from morning dew and spring rain never fully evaporates. That persistent dampness is a perfect growth environment for green algae and mildew. Add Wilmington's notorious pollen season, which typically runs from late February through May and peaks around early April, and you have a thick, sticky substrate that sticks to every horizontal and vertical surface on the home.
Freeze-thaw cycles through January and February do their own damage. Water that worked into micro-cracks in stucco, brick mortar, or composite trim expands and contracts, opening small gaps that catch even more organic debris the following spring. By the time homeowners along Brackenville Road, Hillside Mill Road, or the Greenville neighborhoods near Delaware Route 52 notice the buildup, it has usually been growing for six months or more.

What Soft Washing Actually Does
Soft washing uses low pressure, typically under 100 PSI at the surface, combined with a biodegradable cleaning solution to kill and remove organic growth at the root. The solution, sometimes called a surfactant blend or SH mix in the trade, breaks down the cell walls of algae and mildew rather than just blasting the surface clean visually. That matters because high-pressure washing can leave roots behind inside the siding material. Those roots regrow within a few weeks. A proper soft wash treatment kills the organism. Results last significantly longer, usually two to four years depending on the tree canopy and shade conditions around the home.
Surfaces We Soft Wash in Hockessin and Greenville
- Vinyl siding, the most common exterior in newer Hockessin subdivisions, prone to green algae on north and west faces
- Fiber cement and HardiePlank, requires low pressure to avoid raising the surface texture
- Painted wood siding, still common on older homes near the Greenville historic corridor along Route 52
- Stucco and EIFS, porous surfaces that trap mildew and require a dwell-time approach to clean safely
- Brick and mortar, algae in mortar joints needs a soak, not pressure, to release cleanly
- Soffit, fascia, and trim, often overlooked but a major source of streaking down the face of the home
The True Blue Pro Wash Soft Washing Process
When our crew arrives at a home in Hockessin or Greenville, the first thing we do is a walk-around inspection. We note the siding type, identify any existing cracks or open seams that could let water in, and check for wasp or hornet nests that need to be handled before we start. We also cover any landscaping beds directly below the work area and wet down nearby plantings before and after the chemical application, this is standard practice and protects your shrubs and perennials.
Next we apply the cleaning solution from the bottom up on each wall section. Working bottom to top prevents streaking, and the surfactant in the mix keeps the solution on the surface rather than running off immediately. We let it dwell for several minutes, longer in heavy buildup areas or on north-facing walls with deep algae staining. Then we rinse from the top down with low-pressure water, carrying the dead organic material off the surface completely. The whole process for an average two-story colonial in the Hockessin area typically takes two to three hours.

Neighborhoods and Areas We Cover in 19707 and Nearby Zip Codes
Our service area in this part of New Castle County is broad. In Hockessin (19707), we regularly work in neighborhoods along Brackenville Road, Old Wilmington Road, Lancaster Pike, and the newer residential developments off Faulkland Road. In Greenville, we cover the estates and older colonials along Route 52, Mount Cuba Road, and the communities that sit between Hockessin and the Brandywine Creek corridor. We are also a short drive to Wilmington neighborhoods like Westover Hills (19807) and the Highlands (19806) when customers in those areas need the same service.
How Often Should You Have Your Home Soft Washed?
For most homes in Hockessin and Greenville with moderate tree coverage, every two years is a reasonable schedule. Homes on heavily wooded lots or with north-facing primary elevations often benefit from annual service because the shade never lets the siding fully dry out between rain events. A good rule of thumb: if you can see a green or gray film forming on the siding by midsummer, it is time to call. Waiting until the following spring means the organism has had another full winter to work deeper into the material.

Combining House Washing with Other Services
Many Hockessin and Greenville homeowners book house soft washing alongside gutter cleaning or a driveway pressure wash on the same visit. Combining services saves a scheduling trip and often comes with a small discount on the total job. If your gutters are overflowing or the driveway has embedded tire marks and organic staining from tree sap and leaves, our crew can knock out all of it in one appointment. We also offer wood deck and fence cleaning for the weathered composite and pressure-treated wood decks that are common in the wooded lots throughout 19707.
Why Homeowners in Hockessin and Greenville Choose True Blue Pro Wash
- We know New Castle County surfaces, vinyl, stucco, brick, and HardiePlank all get the right mix and pressure
- Locally operated, not a franchise, the person quoting your job is the same person overseeing the crew
- Biodegradable cleaning solutions safe for landscaping and pets when properly rinsed
- We protect your plantings before we start and rinse them down after every application
- No subcontractors, trained True Blue Pro Wash technicians on every job
- We carry full liability insurance covering Delaware and southeastern Pennsylvania
Frequently Asked Questions
Is soft washing safe for older painted wood siding on historic homes near Greenville?
Yes, when done correctly. We reduce the concentration of the cleaning mix for painted wood and painted brick surfaces, and we keep pressure well below 100 PSI at the surface. The key is dwell time, not pressure. If there is existing paint failure like peeling or flaking, we will flag that before we start rather than hiding it under the wash.
Will the cleaning solution harm my flower beds or shrubs along the foundation?
We wet down all landscaping directly below the work area before applying any solution and rinse it again after we finish each section. The surfactant we use breaks down quickly when diluted with water. Thousands of jobs in New Castle County and we have not had a landscaping damage claim from our process when pre-wetting and post-rinsing are done properly.
How long does a house soft wash take for a typical Hockessin home?
A single-story home usually runs one and a half to two hours. A standard two-story colonial in Hockessin or Greenville typically takes two to three hours from setup to rinse. Homes with heavy mildew on north-facing walls or significant algae in mortar joints may take a bit longer because we let the solution dwell before rinsing.
Can you soft wash in cooler weather, or is this a summer-only service?
We work year-round in Delaware. Spring and fall are actually popular times to book because the surface is not as hot, which helps the cleaning solution dwell longer and work more effectively. We do not work when temperatures are below freezing because the solution will not perform properly, but anything above 40 degrees Fahrenheit is generally workable.
My home is stucco with what looks like black streaking near the roof line. Is that mold?
That black streaking near the roof line on stucco is almost always Gloeocapsa magma, the same roof algae that discolors asphalt shingles. It travels downward from the roof in heavy rain events and colonizes stucco surfaces. Soft washing removes it from both the roof and the stucco walls. If it is only on the siding and not on the roof, it can also be mildew or general atmospheric fallout staining, but we can identify it on-site during the free estimate.
Do you offer any warranty or guarantee on your house soft washing work in Hockessin or Greenville?
We stand behind the results of every job. If visible algae or mildew returns within 90 days of the service under normal conditions, we will come back and re-treat at no charge. We do note that homes with heavy shade from large overhanging trees will naturally see regrowth faster than fully exposed homes, and that is something we discuss with you upfront so expectations are set correctly.