How to Clean a Metal Roof?
April 19, 2025
How to Clean a Metal Roof Without Causing Damage: Expert Tips You Need to Know

At Washington Roofing, we believe every great roof deserves great care. If you’re wondering how to clean a metal roof without causing more harm than good, you’re in the right place. While metal roofs are known for durability and low maintenance, improper cleaning can shorten their lifespan, strip away protective coatings, and even void warranties.
This expert-backed guide will walk you through the best ways to clean your metal roof safely and efficiently, without damaging it in the process. Whether it’s a sleek standing seam or a beautiful Decra metal system, we’ve got you covered.
Why Proper Cleaning Matters for Your Metal Roof
Metal roofing may be tough, but it’s not invincible. Dirt, algae, mold, and airborne contaminants can take a toll over time. Regular roof cleaning helps maintain not only the appearance but also the functionality and safety of your metal roof.
Washington Roofing has seen firsthand how routine care can add years to a roof’s life. Plus, keeping your roof clean prevents rust, minimizes stains, and keeps drainage systems from clogging.
When’s the Best Time to Clean Your Roof?
Timing is everything. The ideal day for cleaning is one that’s cool and dry—not too hot, not rainy, and definitely not windy. Early morning or late afternoon works best to avoid rapid water evaporation or sun glare.
At Washington Roofing, we often recommend that clients schedule their cleaning in the spring or early fall. That’s when roofs have the least buildup and the weather is safest for washing and inspection.
Safety First: Prepare Before You Start Cleaning
Roof cleaning isn’t a task to take lightly. Slips, falls, and chemical exposure are real risks. Before grabbing a ladder or a hose, remember these essential safety tips:
- Always wear non-slip shoes and a harness
- Use a sturdy ladder with a stabilizer
- Avoid cleaning alone—have someone nearby
- Never clean a wet or icy roof
- Don’t pressure wash from the roof itself; stay on the ground if possible
Washington Roofing strongly encourages homeowners to contact professionals for hard-to-reach or steep-pitched roofs. We prioritize your safety above all else.
Choose the Right Tools and Cleaners
When learning how to clean a metal roof, using the right materials is crucial. Avoid abrasive tools like steel wool or wire brushes, which can scratch paint or protective finishes.
- Here’s a basic list of what you’ll need:
- Garden hose or soft wash system
- Soft bristle brush or mop
- Non-abrasive, pH-neutral detergent
- Bucket and sponge
- Optional: biodegradable roof cleaner
Washington Roofing recommends steering clear of harsh chemicals like bleach or ammonia—these can corrode metal over time. Always check your metal roof manufacturer’s guidelines before applying any cleaning solution.
Step-by-Step: How to Clean a Metal Roof Safely
Ready to get started? Here’s the process we follow at Washington Roofing when cleaning metal roofs:
- Clear debris – Remove leaves, twigs, and loose dirt using a blower or broom.
- Rinse the roof – Use a gentle stream of water to wash away surface grime.
- Apply the cleaning solution – Mix a mild detergent with warm water, then use a brush or mop to gently clean sections of the roof.
- Scrub lightly – Don’t press too hard—let the solution do most of the work.
- Rinse thoroughly – Wash off all residues to prevent streaking or spotting.
- Inspect your work – Look for problem areas like rust, peeling paint, or leaks.
A Washington Roofing technician can help identify early signs of wear and suggest proactive fixes to avoid costly repairs down the line.
Special Care for Decra Metal Roofs
Decra metal roofs are known for their unique stone-coated finishes, which require special attention. These finishes are durable but can be damaged by high-pressure washing or harsh scrubbing.
Washington Roofing recommends only soft-wash techniques and specialty cleaners designed for Decra systems. These roofs are an investment—protect them with care and precision.
Avoid These Common Roof Cleaning Mistakes
Even with the best intentions, homeowners sometimes make costly cleaning errors. Here are a few things Washington Roofing warns customers to avoid:
- Using pressure washers – High-pressure streams can strip paint and force water under panels
- Walking on the roof – Foot traffic can dent or dislodge roofing panels
- Using the wrong cleaner – Some chemicals cause discoloration or corrosion
- Ignoring safety gear – Never sacrifice safety to save time
Your roof isn’t just another surface—it’s your first defense against the elements. Treat it accordingly.
How Often Should You Clean Your Metal Roof?
Most experts, including Washington Roofing, recommend cleaning your metal roof once a year. However, if you live near trees, the ocean, or in a high-pollution area, you may need more frequent cleanings.
Watch for signs like:
- Faded or dirty panels
- Dark streaks or algae
- Blocked gutters or downspouts
Routine cleaning keeps your roof beautiful, functional, and weather-ready all year long.
When to Call the Pros
Sometimes, DIY just won’t cut it. If your roof is steep, high, or heavily soiled, it’s best to leave the job to licensed professionals. Washington Roofing offers expert roof cleaning services across the region, ensuring every wash is thorough, safe, and warranty-compliant.
Plus, we do more than just clean—we inspect, repair, and restore metal roofs to like-new condition. It’s all part of our commitment to quality, safety, and service you can count on.
Contact Us
When it comes to knowing how to clean a metal roof without causing damage, knowledge is power, but execution is everything. With the right tools, timing, and techniques, you can maintain a beautiful, durable roof for decades.
And when in doubt, trust the pros at Washington Roofing. We’ve been helping homeowners like you protect what matters most, one roof at a time. Whether it’s jan maintenance, seasonal touch-ups, or full roof restoration, we’re just a phone call—or email—away.
Let Washington Roofing bring the shine back to your metal roof. Contact us today and get a free roof cleaning estimate you can trust.

Hailstorms can be a homeowner's worst nightmare, leaving behind hidden roof damage that might not be noticeable at first glance. If you've recently experienced a storm, you might be wondering: What does hail damage look like on a roof? Recognizing the warning signs early can save you from costly repairs down the road. At Washington Roofing, we help homeowners assess and address hail damage before it turns into a major issue. In this guide, we’ll walk you through the telltale signs of hail damage, how to handle insurance claims, and when it’s time to consider roof replacement. Understanding Hail Damage: What to Look For Hail comes in various sizes, and even small hailstones can cause significant damage to your roof. The extent of the damage depends on the size, speed, and density of the hail, as well as the age and condition of your roof. Washington Roofing recommends inspecting your roof after every major storm to identify any visible signs of wear and tear. Common signs of hail damage include: Dents in shingles that compromise their protective layer Bruising (soft spots on asphalt shingles that indicate underlying damage) Granule loss, which weakens the shingles and exposes the roof to further weather-related deterioration Cracks or splits in wood or slate roofing materials Dents in metal roofing, which can affect both durability and appearance The Impact of Hail on Different Roofing Materials Not all roofs react to hail damage in the same way. Different materials have varying levels of resistance: Asphalt Shingles – The most common roofing material, asphalt shingles are prone to bruising, granule loss, and cracks. Metal Roofs – While metal roofing is durable, it can still sustain dents in severe storms. Slate & Tile Roofs – These materials can crack under the impact of large hailstones. Wood Shake Roofs – Hail can split wood shakes, leading to moisture penetration and rot. At Washington Roofing, we specialize in repairing and replacing all types of roofing materials, ensuring your home remains protected after a storm. How Hail Damage Can Lead to Bigger Problems Ignoring hail damage can result in more serious issues for your home. Over time, damaged shingles can allow water to seep in, leading to: Leaks and water damage inside your home Mold growth due to trapped moisture Structural weakening of your roofing system If you suspect hail damage, it's crucial to contact a professional roofing company like Washington Roofing to assess the extent of the issue and recommend appropriate solutions. How to Spot Hail Damage on Your Roof If you’re wondering what does hail damage look like on a roof?, here are some easy ways to check: Inspect Your Gutters – If you notice excessive granules from your shingles in the gutters, your roof may have suffered damage. Check for Dents in Metal Surfaces – Look at vents, flashing, and gutters for signs of impact. Examine Your Attic for Leaks – Any unexpected water stains could indicate roof damage. Walk Around Your Property – Damaged siding, outdoor furniture, or vehicles may be a sign that your roof was also affected. For a thorough inspection, trust Washington Roofing to provide expert assessments and recommendations. Does Homeowners Insurance Cover Hail Damage? One of the biggest concerns for homeowners is whether their insurance will cover hail damage repairs. Most policies do include coverage for hail-related roof damage, but there are some factors to consider: Your deductible – The amount you must pay before insurance kicks in The age of your roof – Older roofs may have limited coverage Policy exclusions – Some policies exclude cosmetic damage, even if it affects the roof’s lifespan At Washington Roofing, we work with homeowners to navigate the claim process, ensuring they get the coverage they deserve. Steps to Take After Discovering Hail Damage If you find evidence of hail damage, follow these steps: Document the damage – Take clear photos of all affected areas. Contact your insurance provider – File a claim and schedule an inspection. Get a professional roof inspection – Washington Roofing provides detailed inspections and reports to support your insurance claim. Obtain repair or replacement quotes – Always get multiple quotes to ensure fair pricing. Schedule repairs or a roof replacement – Work with a reputable company like Washington Roofing to restore your roof’s integrity. Roof Replacement vs. Repair: Which One Do You Need? Depending on the severity of the damage, you may need either roof repair or a full roof replacement. Minor damage? Repairs may be sufficient, especially if only a few shingles are affected. Extensive damage? A full replacement may be necessary to maintain your home’s protection. Choosing the Right Roofing Products for Hail Protection When replacing your roof, consider impact-resistant products designed to withstand future storms. Some top choices include: Class 4 impact-resistant asphalt shingles Metal roofing with high durability Synthetic slate and rubber roofing for enhanced resilience Washington Roofing provides top-quality materials to ensure your new roof offers maximum protection against future hailstorms. Why Washington Roofing is Your Trusted Roofing Company When dealing with hail damage, choosing a reliable roofing company is essential. Here’s why Washington Roofing is the best choice: Experienced Professionals – Decades of experience handling storm-related roof damage Insurance Assistance – We guide you through the claim process High-Quality Materials – Durable products for long-lasting protection Free Inspections & Quotes – Transparent pricing with no surprises Don’t wait until minor damage turns into a major issue—trust Washington Roofing for expert roof replacement and repair services. Contact Washington Roofing Today If you suspect hail damage on your roof, don’t delay! Call Washington Roofing for a free inspection and professional advice. Whether you need a quick repair, an insurance quote, or a full roof replacement, our team is here to help. Protect your home with quality craftsmanship and trusted service. Contact Washington Roofing today for a free quote.

Moss on rooftops in Kirkland, WA may look harmless, but it can cause serious damage by trapping moisture, lifting shingles, blocking drainage, and reducing energy efficiency. Over time, this can lead to leaks, rot, and costly repairs.
Washington Roofing Services offers professional roof cleaning and replacement to prevent moss-related damage. Our expert team provides inspections, soft washing, and long-term solutions like copper or zinc treatments.

Deciding whether to repair or replace your roof depends on its condition, age, and long-term costs. Minor issues like small leaks, missing shingles, or flashing problems can often be repaired, especially if the roof is under 10 years old. However, widespread damage, an aging roof (20+ years), or frequent repairs may signal the need for a full replacement.
Monroe, WA homeowners face unique weather challenges, making regular inspections essential. Washington Roofing Services provides expert guidance to help you make the best decision for your home. Contact us today for a free consultation!