The Problem
Coral Gables roofs sit under heavy tree canopy in neighborhoods like the Historic District and the Old Cutler Road corridor, which means shade and moisture linger on roofing longer than in open, sun-exposed areas. That combination produces dark algae streaking, green moss patches, and tannin staining from oak and ficus leaves that rain alone doesn't remove.
The Diagnosis
- ▸Algae and moss — black streaking or green patches, usually on shaded, north-facing roof sections. The most common issue we see in Coral Gables.
- ▸Tannin staining — brown blotches from leaves and debris, particularly around valleys and gutters.
- ▸Lichen — crusty, light-colored growth that's more resistant than surface algae and needs a longer dwell time to fully treat.
The Solution
- ▸Soft wash roof cleaning — removes algae, moss, and streaking without the pressure that can crack tile or strip shingle granules.
- ▸Longer dwell time for lichen — the cleaning solution sits longer before rinsing to fully clear resistant growth.
- ▸Roof-and-gutter cleaning — clears the debris contributing to the staining in the first place, particularly in valleys under heavy canopy.
Once we know what we're treating, we select the method — diagnosis first, then the right clean.
Booking Process
Book and describe the staining you're seeing.
On-site diagnosis of staining type and roof condition.
Full soft wash roof cleaning with method matched to diagnosis.
Final inspection together.
What Coral Gables, Florida Customers Say About Hank Robotics
"Absolutely incredible experience with Hank's Robotics. Their drone cleaning service is next level and something you truly have to see in person. The team was professional, punctual, and extremely knowledgeable, and the results were outstanding. They cleaned hard-to-reach exterior areas on a luxury property with amazing attention to detail. I highly recommend Hank's Robotics."
"Fantastic partner and best in the drone cleaning business. Great communication and attention to detail."
"As a business operator, you encounter vendors that worry more about getting the signature on paper than delivering the service they promised. With Hank Robotics I found that from beginning to end, they go above and beyond to make sure the client is happy. They were professional and worked hard to make sure the service was delivered as promised. I would recommend their service to any business."
Frequently Asked Questions
Why does my roof keep growing algae even after cleaning?
Shaded, damp roof sections under tree canopy regrow algae faster. A regular cleaning schedule keeps it from building back up.
Is lichen harder to remove than algae?
Yes — lichen is more resistant and needs a longer treatment dwell time to fully clear.
Does gutter debris make roof staining worse?
Yes — clogged gutters and valleys hold moisture against the roofline, which speeds up algae and moss growth nearby.
