Single-story brick home with a light gray shingle roof under oak trees

Roof Cleaning

Black streaks and algae stains removed the safe way. No high pressure, no warranty issues, no damage to your shingles or tiles.

Get a Roof Cleaning Quote Call (407) 587-6335

Classic Pressure Washing & Window Cleaning provides professional roof cleaning for shingle, tile, and metal roofs in Orange City and across Volusia, Seminole, and Orange counties, Florida. We use the soft wash method ARMA, the Asphalt Roofing Manufacturers Association, recommends for asphalt shingle roofs, at under 500 PSI, to remove black streaks (Gloeocapsa magma) and algae without voiding warranties. Most residential roof cleanings cost $300 to $600. 20 Google reviews, 20 of them five stars. Licensed, insured, and locally owned since 2018. Free on-site estimates with same-day response.

What the black streaks are and how we remove them

Reviewed by Clark Sabo | Last updated September 25, 2026

What the black streaks are

Those dark streaks running down your roof are a living organism called Gloeocapsa magma, an airborne algae that thrives in Florida's hot, humid climate. Once it lands on your shingles, it feeds on the limestone filler baked into the roofing material. Over months and years the colony spreads across the roof, turning it from its original color to a patchy mix of dark stains.

Left alone, the algae does more than look bad. It holds moisture against the shingle surface, and the granules that shield the asphalt layer from UV wear off faster than they should.

$300 to $600 for most roofs

Size, pitch, and how heavy the staining is move the number. Exact price quoted on site before work begins.

Insurance and your roof's condition

We cannot tell you what your carrier looks for, so ask them directly. What we can do is send you into that conversation with a clean roof. Our guide on roof cleaning and Florida homeowner's insurance covers the questions worth asking.

Our soft wash method

We clean roofs with the soft wash method only, at under 500 PSI, from the ground or from stable ladder positions. The solution soaks into the algae colony and kills it. As the growth dies, rain carries it off over the following days and weeks, and the roof comes back to its original color without anyone walking the shingles, standing on the tiles, or pointing high pressure at the roofing material.

We adjust the approach to the roofing material. Asphalt shingles, concrete tile, clay barrel tile, and standing-seam metal each have their own sensitivities. The solution concentration, dwell time, and rinse method all change with what we're working on, and we walk you through it at the estimate so there are no surprises.

A typical residential roof cleaning in Volusia County takes three to five hours depending on size, pitch, and how heavy the staining is. We clean roofs throughout the area, including roof cleaning in DeBary and roof cleaning in Port Orange, and the surrounding communities. We finish in a single visit and clean up any overspray or runoff before we leave.

Roof types we clean

3-tab and architectural asphalt shingles
Flat concrete roof tiles
Barrel (S-shape) clay and concrete tiles
Standing-seam and corrugated metal

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Specialized Roof Cleaning Services

The method matters as much as the result. Here is how we approach it.

Roof Soft Washing

Those black streaks are algae eating the shingle, not dirt sitting on top of it. High pressure strips the protective granules off the surface and can void your manufacturer warranty. That is why we soft wash every roof: low pressure, the right chemistry, and algae killed at the root instead of blasted off to grow back.

Our soft wash system applies contractor-grade surfactants at under 500 PSI. The chemistry does the work. The solution penetrates the colony, kills Gloeocapsa magma, and lets rain rinse the dead growth away over the following days. No one walks on your shingles and no high-pressure tip touches the roofing. It is the soft wash method ARMA, the Asphalt Roofing Manufacturers Association, recommends for asphalt shingle roofs.

We soft wash asphalt shingles (3-tab and architectural), concrete and clay barrel tile, standing-seam metal, and flat commercial roofing. Each material gets a different solution concentration and dwell time.

Where we clean roofs

We clean roofs across Volusia, Seminole, and Orange counties. Three Volusia County cities where roof algae gets a head start, and why.

Roof cleaning in DeBary

River fog off the St. Johns and morning dew keep roofs damp well into the day, so the stucco homes with tile roofs in Glen Abbey and DeBary Plantation need regular cleaning to stay ahead of the algae.

Roof cleaning in Deltona

Concrete-block homes from the 1960s and 70s on uniform lots, and the shingle roofs pick up heavy black Gloeocapsa magma staining.

Roof cleaning in New Smyrna Beach

Salt spray on the oceanfront and canal-front homes, and dense hardwood canopy inland near the Sugar Mill Ruins, so roofs on both sides of town stay damp and stained.

When to Clean Your Roof in Florida (and Why Your Insurance Company Cares)

What causes black streaks on Florida roofs, what to ask your insurer about roof condition, and why we soft wash every roof.

Regrowth Guide

Why Algae Comes Back Faster on Some Roofs Than Others

Tree canopy, water proximity, roofing material, and orientation, mapped across the 23 cities we serve, with a cleaning-frequency guide.

Roof Cleaning FAQ

Will roof cleaning void my shingle warranty?

Not the way we do it. High pressure strips granules off the shingle and can void the warranty, which is why we never use it on a roof. We soft wash exclusively, at under 500 PSI, with the soft wash method ARMA, the Asphalt Roofing Manufacturers Association, recommends for asphalt shingle roofs.

What are those black streaks on my roof?

Those dark streaks are Gloeocapsa magma, an algae that feeds on the limestone filler in asphalt shingles. It starts as small spots and spreads across the roof, and the stains get darker the longer it sits. The algae also holds moisture against the shingle surface, which can speed up granule loss.

Can a dirty roof affect my homeowner's insurance?

We cannot speak for your carrier, so ask them what they look at. What we can say is that a roof covered in black streaks looks neglected in any photo, and a soft wash takes that question off the table.

How long does a roof cleaning last?

The solution kills the algae rather than rinsing it off, so the roof stays clean until new growth takes hold. In Central Florida we tell most people to plan on exterior cleaning every 12 to 18 months. Heavy oak canopy or a north-facing slope shortens that, so plan on the early end.

Do you offer roof cleaning near me?

Yes, as long as you're in Volusia, Seminole, or Orange County. We're based in Orange City. Give us your ZIP code when you call and we'll set up a free estimate with same-day response.