Residential · Metal Roof Care
Metal Roof Cleaning Lexington, KY | Algae, Streaks & Dirt
Metal roof cleaning in Lexington lifts algae, mildew, pollen, and grime from painted, coated, and Galvalume metal roofs without high pressure. The crew tests the cleaner on a small spot, keeps the spray off the seams, and rinses the roof clean.
Finish Protected
Low Pressure
Free Estimates
Metal Roof Cleaning in Lexington, KY
Metal roof cleaning in Lexington washes the algae, mildew, pollen, and dirt off painted, coated, and Galvalume metal roofs with low pressure and a cleaner picked for the finish. Metal roofs shed water well, but wet leaves and dirt can hold moisture against the panels, and a hard stream can force water under the seams and wear down the paint. We clean metal roofs as part of our roof cleaning service. Here’s how a metal roof wash works.
- Pricing: set after we look at the roof size, the pitch, the access, and how much growth there is
- Method: test the cleaner, wet down the plants, apply it at low pressure, then rinse the roof clean
- Finish: painted, coated, and Galvalume panels each get a cleaner and pressure that suit the finish, plus a test spot first
- Timing: set around cool, cloudy days, since cleaner dries too fast on hot metal
Why Do Metal Roofs Turn Green, Streaked, and Dull?
Metal roofs turn green and streaked when algae and mildew grow on the panels, and they turn dull when dirt, pollen, and leaf stains pile up. Moisture is the common thread, because shade, tree cover, and slow drying give growth a place to hold on. Our soft washing page explains how low pressure cleaning lifts growth without blasting the surface.
Debris makes the problem worse. A U.S. Steel bulletin on Galvalume says wet leaves and other debris shouldn’t sit against the sheet, because trapped moisture speeds up corrosion. Lexington’s tree-lined streets drop leaves and pollen onto roofs, so a metal roof collects more than you’d guess from the ground. Our algae, mold, and mildew guide explains how that green film grows and spreads.
How Do We Clean Each Problem on a Metal Roof?
Each roof problem needs its own treatment, and the table below shows how the crew handles the common ones.
Problem on the roof | How it’s cleaned |
Green algae and mildew | A cleaner made for organic growth goes on at low pressure, sits for its dwell time, and gets rinsed off, and the roof maker’s care steps decide which cleaner is used. |
Pollen, dust, and leaf stains | Loose leaves and debris come off first, then plain water and a mild detergent with a soft brush lift the film, which is the routine that metal roof suppliers recommend. |
Tree sap and grease | Sap and grease need a stronger product, and suppliers say to check the roof maker’s care steps and the safety data sheet first, so the crew tests before it treats. |
Rust streaks | A rust streak is a stain on the finish, so the crew looks for where it starts before treating it, and hard scrubbing can scratch the paint. Our rust stain removal guide covers where the stains come from. |
Chalky, faded paint | A faded or chalky finish is a paint problem, so a wash lifts the dirt and loose chalk, but it can’t bring back color the paint has lost. |
Gutters, valleys, and seams | Leaves packed into valleys and gutter lines get cleared first, since wet debris holds moisture against the metal. |
Can You Pressure Wash a Metal Roof?
Pressure washing is a poor fit for metal roofs, and the suppliers that sell them say so. Metal Sales says a garden hose rinse is enough for most dirt and that a pressure washer isn’t warranted in most cases. Advanced Aluminum puts power washers on its list of tools to avoid, and Mid-Florida Metal Roofing Supply lists high pressure power washers among the tools to avoid at any level of cleaning.
Seams and fasteners are the weak points. A hard stream can force water under a panel overlap, wear down the paint, and leave a roof leaking after the wash, so the crew keeps the pressure low and the spray off the seams. Mid-Florida adds that abrasive methods wear down the finish and leave panels open to corrosion.
Warranties matter too. Mid-Florida says misusing cleaning agents can void a warranty, so the crew checks the roof maker’s care steps first. You can read Metal Sales’ metal roof care guide for a roof maker’s own steps.
Is Bleach Safe to Use on a Galvalume or Painted Metal Roof?
Roof suppliers don’t agree on whether bleach is safe on a metal roof. Metal Sales and Advanced Aluminum both give a diluted bleach mix for mildew, and Advanced Aluminum warns never to mix bleach with ammonia. Mid-Florida Metal Roofing Supply says never to use bleach at all.
The type of metal and the finish decide the answer. Galvalume is a common metal roof coating of aluminum and zinc on steel, and a U.S. Steel bulletin says acids below pH 4 and alkalis above pH 9 attack that coating. Newcastle Metal’s roof care guide calls for a mild cleaner in warm water, a soft cloth or brush, and a low pressure spray. It allows bleach only for mildew that won’t come off, as one cup of bleach and one cup of mild soap in five gallons of water, never blended with other cleaners, and it asks for a thorough rinse with clear water.
Roof cleaners on professional forums split on it too. Some use sodium hypochlorite mixes on painted metal, others report that bare Galvalume can dull or darken, and a few won’t clean it at all, so the finish decides. The crew adjusts the cleaner and the pressure to each finish, because painted steel, coated panels, and Galvalume all react differently. The roof maker’s steps and a small test spot come before the full roof, and a roof the maker says won’t take bleach gets a mild non bleach cleaner.
Is It Safe to Walk on a Metal Roof to Clean It?
Walking on a metal roof to clean it is risky, and wet metal makes it worse. OSHA calls wet metal roofs a major hazard and says workers should avoid them, and it requires fall protection for workers 6 feet or more above a lower level.
Algae and dust add to the problem, because a green or dusty panel gets slick when it’s wet. Metal Sales also warns that walking on some areas can damage the panels, so the roof maker’s rules come first.
The crew works from the ground or a ladder and doesn’t walk on wet or algae covered panels. A ladder only reaches so far, and on a tall or wide roof the upper sections can sit out of reach from the ground, so we say up front how much of the roof we can clean from the ground and the ladder.
What Should Never Be Used on a Metal Roof?
Metal roofs get damaged by a short list of products and tools, and they’re all easy to skip. Advanced Aluminum and Mid-Florida both warn against wire brushes, steel wool, sandpaper, scouring powder, paint thinner, and paint remover, and Mid-Florida says abrasive methods wear down the finish and leave panels open to corrosion.
Rust treatments need care as well. Advanced Aluminum says rust treatments should be rinsed off within five minutes, so a product that’s left to sit on the metal can hurt the finish.
Every cleaner gets a test on a small spot first, in a place nobody will notice, and the roof maker’s care steps come before any product. Advanced Aluminum says to confirm the method with the panel maker before using any solution.
When Is the Best Time to Clean a Metal Roof in Lexington?
Metal roofs get cleaned best on a cool, cloudy day with no rain in the forecast, because cleaner dries too fast on hot metal, and that’s when streaks show up. Our scheduling guide covers how the Lexington seasons set the calendar.
Fall cleaning works well once most of the leaves have dropped, because it’s a chance to clear the roof before winter. Wet leaves held against the panels trap moisture, according to the U.S. Steel bulletin.
Roofs don’t all need the same schedule. Mid-Florida suggests a light cleaning once a year and a deeper cleaning every 3 to 5 years, depending on conditions, so a roof under trees may need the yearly visit more than a roof in the open.
Where Does Metal Roof Wash Water Go in Lexington?
Metal roof wash water carries cleaner, algae, and dirt down the panels into the gutters and downspouts, so it needs a plan before the rinse starts. Our wash water and storm drains guide lays out where the water can and can’t go.
Plants near the house take the most spray, so the crew wets them down before the cleaner goes on and rinses them again afterward. Roof runoff that would reach bare soil or a storm drain gets planned for ahead of time.
Anyone who sees cleaner or wash water flowing into a storm drain can report it to LexCall at 311 or (859) 425-2255.
What Should a Homeowner Ask Before Hiring a Metal Roof Cleaner?
A homeowner should ask five things before hiring a metal roof cleaner: what cleaner the crew uses on the roof’s finish, how much pressure goes near the seams, whether the crew walks on the roof, how the plants and wash water are handled, and what the roof warranty says.
Our crew answers all five before the job: we use low pressure and a cleaner picked for the finish, test a small spot, keep the spray off the seams, and wet down the plants. We clean the roof, and we don’t repair leaks, replace panels, or coat the roof, so a homeowner who needs that work hires a roofer. The guide to choosing a pressure washing company shows how to compare crews before you book.
Our Process for Metal Roof Cleaning
Look, Test, and Clear
We check the finish, the seams, and the amount of growth, test the cleaner on a small spot, and clear loose leaves and debris from the roof and valleys.
Protect and Pre-Wet
Nearby plants get wet down and covered where needed, and the roof gets a plain water rinse to wet it and remove loose grit.
Apply Cleaner and Let It Work
The cleaner goes on at low pressure from the bottom up, sits for its dwell time, and a soft brush works any stubborn spots.
Rinse and Walk Through
The roof gets a thorough rinse from the top down, the plants get rinsed again, and we walk you through what we found.
How Much Does Metal Roof Cleaning Cost in Lexington, KY?
Metal roof cleaning in Lexington is priced after we look at the roof, since the size, the pitch, and the amount of growth change the work. Our pricing guide breaks down what goes into an exterior cleaning quote.
- The size of the roof in square feet
- The pitch and the height of the roof
- How much algae, mildew, and staining there is
- How the roof is reached and what needs protecting nearby
Why Choose Our Lexington Metal Roof Cleaning Crew
Gentle on the Finish
Low pressure and a spray kept off the seams protect the paint and the panel overlaps.
Cleaner Matched to the Metal
Painted, coated, and Galvalume panels each get a test spot first, so the cleaner and the pressure fit the finish.
Straight Answers
We’ll tell you up front when faded paint, rust, or old oxidation is a finish problem that a wash can’t fix.
Common Questions
Metal Roof Cleaning FAQs
Lexington homeowners ask these questions before they book metal roof cleaning.
Our 30-Day Satisfaction Guarantee
Our 30-day guarantee covers the metal roofs we wash. If a spot looks wrong within 30 days, call us or message us through the contact form, and we’ll come back at no extra charge. Faded paint, rust that starts at a fastener, or old oxidation can leave a mark, so we say so before we start.
Related Cleaning Services
Metal roofs connect to gutters, siding, and the plants around the house. Here are related services.
Get a Free Metal Roof Cleaning Estimate
Ready for a cleaner roof? Request a free estimate, and we’ll look at the roof, the finish, and the plants and gutters around the house. Lexington PressureWash handles every job.