Removing algae, lichen, and biological growth from tile, shingle, and metal roofs across Lee and Collier counties — low-pressure soft wash, the method roofing manufacturers recommend.
Southwest Florida has some of the most aggressive biological growth on residential rooftops of any region in the United States. The combination of year-round warmth, high humidity, frequent summer rain, and Gulf Coast salt air creates near-ideal conditions for Gloeocapsa magma, algae, lichen, and moss to colonize and spread. Most homeowners mistake the resulting dark streaks and discoloration for dirt or age. They are not. The black streaks on Florida roofs are living organisms actively degrading your roofing material — and they require a specific treatment to eliminate completely.
Gloeocapsa magma is the most common culprit: a cyanobacteria that feeds on the calcium carbonate in concrete roof tiles and asphalt shingles. It is airborne and spreads from roof to roof, which is why entire neighborhoods often share the same pattern of dark streaking. Lichen frequently follows initial algae colonization and is significantly more destructive — it attaches to surfaces with root-like structures that penetrate tile coatings and strip granules from asphalt shingles. Moss holds moisture against the roofing material, accelerating surface deterioration and risking infiltration under roofing elements. Several major roofing manufacturers explicitly void warranties when biological growth is present and untreated. The maintenance math is straightforward: a $400 cleaning every two to three years against a $15,000 to $35,000 roof replacement.
Rain Exterior Home Service provides professional soft wash roof cleaning throughout Lee, Collier, and Charlotte counties. Soft washing applies a professional-grade biodegradable solution at low pressure — under 500 PSI, similar to a residential garden hose — that kills biological growth at the cellular level. Unlike pressure washing, which blasts visible growth off the surface while leaving root systems and spores behind and returns within 3 to 6 months, soft washing treats the organism itself. A properly executed soft wash keeps a SWFL roof clean for 2 to 4 years.
We clean concrete tile, clay barrel tile, asphalt shingle, metal panel, and modified bitumen roofs. Each material requires a different solution concentration and technique — not a one-size-fits-all approach. Concrete tile, the dominant residential roofing material throughout Lee and Collier counties, tolerates effective solution concentrations that would damage asphalt shingles. We assess your roofing material before applying any treatment and will not proceed if the roof has damage that would be worsened by cleaning.
The same organisms that streak your roof — Gloeocapsa magma, algae, mold, and lichen — also colonize stucco walls, soffits, and screen enclosure frames, and they respond to the same soft wash treatment. Many homeowners pair roof cleaning with a full house washing on the same visit: one mobilization, one landscape-protection setup, and a complete exterior reset from ridge line to foundation. Ask about the combined package when you request an estimate.
We provide soft wash roof cleaning throughout Lee, Collier, and Charlotte counties — from Gulf Coast communities to inland neighborhoods. Every area in Southwest Florida is covered.
How It Works
We walk the perimeter and assess the roofing material — concrete tile, clay barrel tile, asphalt shingle, or metal — and document the extent and type of biological growth. If the roof has pre-existing damage that would be worsened by cleaning, we inform you before proceeding.
We pre-soak all landscaping in the fall zone, cover HVAC units and air intakes, and confirm gutters and downspouts are clear. Our solution is biodegradable, but we protect every plant and surface as standard practice on every job.
A professional-grade biodegradable solution is applied at low pressure — under 500 PSI, similar to a garden hose. The solution kills Gloeocapsa magma, algae, lichen, and moss at the cellular level. Concentration is matched to your roofing material: tile tolerates a stronger formulation than asphalt shingles.
The solution dwells 15 to 30 minutes — long enough to kill root systems, not just surface growth. A low-pressure rinse clears all residue. We walk the roof with you for a final inspection and provide before/after photos and a written service record with every job.
Common Questions
The dark streaks across rooftops throughout Southwest Florida are caused by Gloeocapsa magma — a cyanobacteria that feeds on the calcium carbonate in concrete roof tiles and asphalt shingles. It is airborne and spreads from roof to roof across entire neighborhoods. Left untreated, it is joined by lichen — which physically penetrates the tile coating with root-like structures — and moss, which holds moisture against the surface and accelerates deterioration. Some roofing manufacturers void warranties if biological growth is present and untreated.
No. Soft washing is applied at under 500 PSI — similar to a residential garden hose. Pressure washing, which we do not use on roofs, strips protective granules from asphalt shingles, cracks and dislodges tile mortar at ridge caps, and forces water under flashing. Major roofing manufacturers including GAF, CertainTeed, and Owens Corning explicitly recommend soft washing over pressure washing in their maintenance guidelines. We use formulations matched to each material — concrete tile, clay tile, shingle, and metal all receive different solution concentrations.
Most roofs across Lee and Collier counties need professional cleaning every 2 to 3 years. Florida's year-round heat and humidity accelerate biological growth faster than in any other region of the continental United States. Properties near canals, under heavy tree cover, or in shaded areas may need annual cleaning. Metal roofs in coastal communities near the Gulf benefit from cleaning every 18 to 24 months due to salt air creating surface conditions favorable to accelerated corrosion and biological growth.
Pressure washing blasts visible growth off the surface while leaving root systems and spores behind — regrowth returns within 3 to 6 months. It also physically damages roofing material. Soft washing uses low-pressure water and a professional biodegradable solution to kill the organism at the cellular level. The growth is dead, not displaced, so results last 2 to 4 years in SWFL conditions. Soft washing is the only method recommended by roofing manufacturers for residential roof maintenance.
Yes. We use biodegradable solutions that break down quickly in soil. Before application, we pre-soak all landscaping in the fall zone. After the roof rinse, we flush all plantings again. For properties near canals, tidal areas, or the Gulf, we use environmentally considered formulations and avoid application before rain events to prevent concentrated runoff. The solution dilutes significantly as it moves through gutters and disperses into the ground.
For most single-story homes in Lee and Collier counties, professional soft wash roof cleaning ranges from $350 to $800, depending on roof size, pitch, material, and level of biological buildup. Two-story homes and larger roofs are at the higher end of that range. We provide free on-site or virtual estimates with exact pricing before any work begins — no deposits, no surprises. Consider that a professionally maintained roof adds years to its useful life: a roof replacement in Southwest Florida costs $15,000 to $35,000.
Yes. We clean concrete tile, clay barrel tile, asphalt shingle, standing seam metal, metal tile, and low-slope modified bitumen roofs. Concrete tile is the dominant roofing material across Lee and Collier counties and tolerates effective solution concentrations well. Asphalt shingles require careful concentration control to clean thoroughly without surface damage. Metal roofs require specialized formulations that prevent rust acceleration and coating damage. Each roof is assessed before treatment begins.
What Homeowners Say
"Our tile roof had black streaks all the way across it — looked terrible for years. After soft washing it looks like a different house. The streaks are completely gone. Wish I had done this years ago."
"I was worried about my shingles but they explained the soft wash process before starting. No pressure — just solution and a gentle rinse. The roof looks brand new and everything is still intact."
"Had a HOA notice about algae on the barrel tile roof. Rain came out next day, cleaned it completely, and gave me before/after photos to submit. HOA closed the notice within a week. Fast and professional."
Serving Fort Myers, Cape Coral, Naples, Bonita Springs, and all of Southwest Florida. Most jobs quoted within 24 hours.
Rain Exterior Home Service
We Regularly Serve Homeowners in Southwest Florida: