Low-pressure exterior cleaning for Marietta homes and businesses in Cobb County
Marietta is one of metro Atlanta's oldest and most architecturally diverse communities. The city spans a wide range of residential construction — from pre-Civil War era homes near Marietta Square and the historic district, to mid-century brick ranches throughout East Cobb, to the newer craftsman and traditional construction filling in communities along Barrett Parkway and Dallas Highway. What unites all of these eras and styles is their vulnerability to the biological growth that Georgia's climate produces relentlessly. Soft washing is the safe, proven solution for every one of them.
Thrare Contracting provides professional soft washing throughout Marietta and Cobb County. We apply biodegradable cleaning solutions at low pressure — under 500 PSI — allowing the chemistry to eliminate algae, mold, mildew, bacteria, and lichen at the biological level. The result is a thorough, long-lasting clean that protects your exterior surfaces rather than eroding them.
Marietta's position in the Rolling Hills region of the Georgia Piedmont means the city receives ample rainfall and experiences high relative humidity from spring through fall. The Kennesaw Mountain corridor and the wooded ridgelines throughout East Cobb create significant tree canopy coverage over residential areas, reducing sun exposure to rooftops and shaded elevations. These conditions — persistent moisture, limited sunlight, mild winters — create a perfect incubator for the biological growth that degrades exterior surfaces.
The black streaks that appear on asphalt shingle rooftops across Cobb County neighborhoods are caused by Gloeocapsa magma, a cyanobacteria that travels by spore and feeds on the limestone filler in shingles. On a shaded Marietta roof, this organism can establish visible colonies within two to three years of installation. Pressure washing at 2,500 PSI will knock the discoloration off the surface, but living spores embedded in the shingle matrix simply regrow within months. Soft washing's chemical kill mechanism eliminates the organism completely, producing results that last three to five years on most Marietta rooftops.
Marietta's older brick and wood construction presents additional challenges. The historic properties near the Square, the brick colonials in the Terrell Mill and Murdock Road corridors, and the wood craftsman bungalows in East Cobb's Lassiter area all require cleaning methods that respect the materials — high pressure erodes mortar joints, lifts wood grain, and damages aged brick faces. Soft washing provides a deep clean without any mechanical abrasion.
Soft washing works because exterior biological growth is alive and responds to chemistry. The organisms that stain your roof and siding — algae, mold, mildew, bacteria, lichen — are not simply dirt. They are living colonies with cellular structures, reproductive cycles, and the ability to regrow from microscopic residue left behind by mechanical cleaning methods. Soft washing addresses this biology directly.
Our biodegradable solutions contain surfactants that penetrate the biofilm layer protecting algae and bacterial colonies, and sanitizing compounds that disrupt cellular membranes, causing complete organism death. After dwell time, a low-pressure rinse removes all dead material from the surface. Because no viable organisms remain, regrowth is dramatically slowed compared to pressure washing results. Most surfaces stay visibly clean two to three times longer after soft washing than after equivalent pressure washing.
We serve residential and commercial customers throughout all Marietta communities:
Marietta serves as the Cobb County seat and hosts a wide range of commercial, industrial, and institutional properties. We provide commercial soft washing services for office complexes, retail centers, apartment communities, HOA common areas, and municipal facilities throughout Cobb County. As an MBE/DBE-certified contractor, Thrare Contracting is positioned to work on government-contracted cleaning projects in the Marietta area. Our crews work around business hours to minimize disruption.
Thrare Contracting is a minority-owned, MBE/DBE-certified property services company based in Stone Mountain, GA. We serve residential and commercial customers throughout Cobb, Fulton, DeKalb, and Gwinnett counties. Our crews are fully licensed and insured, carrying $2 million in general liability coverage on every job. We provide free estimates within 24 hours of inquiry.
Serving all Marietta neighborhoods and Cobb County.