Safely remove moss, algoe, black streaks, lichen, dirt, and organic
buildup with professional roof cleaning designed for all roof types.
Those black streaks and green patches aren’t just dirt. They’re living organisms that can damage your roof over time.
The bacteria that causes black streaks on asphalt shingles.
Feeds on limestone filler in shingles, causing discoloration and staining.
Retains moisture and can lift and separate shingles.
A combination of algae and fungus that can deteriorate roofing materials.
Leads to rot, leaks, and reduces your roof’s lifespan.
Regular roof cleaning protects your home and prevents costly repairs.
Everything needed to make your roof look clean, fresh, and last longer.
We use professional soft washing techniques that clean safely and effectively.
Moss holds moisture like a sponge. Over time, it can separate shingles, pry up edges, and create the perfect environment for rot, leaks, and costly damage.
Removing moss early can add years to the life of your roof.
We inspect your roof and assess the type of roof and level of buildup.
We apply a professional cleaning solution that targets algae, moss, lichen and bacteria.
The solution penetrates and kills organic growth at the root.
Low-pressure rinse removes all dead organic matter safely.
We do a final walkthrough to ensure your roof is clean and your property is spotless.
Safe. Effective. Roof-Safe.
That’s the Wash Dudes way.
No matter the material, we use the
right method for a safe, thorough clean.
If you notice any of these signs, it’s time for a professional roof cleaning.
Professional roof cleaning with safe methods, reliable service, and results homeowners can trust.
Hundreds of happy homeowners
across Ottawa!
Trained professionals with the right equipment and safe techniques.
We use low pressure and proven solutions that won’t damage your roof.
Your home is protected with full liability insurance.
Proudly serving our community with honest, reliable service.
We stand behind our work and your happiness is our priority.
Real Results. Real People.
Don’t just take our word for it — hear from homeowners across Ottawa who trust us to keep their homes clean, bright and beautiful.
293+ 5-Star Reviews
Posted on Google![]()
Grace YangTrustindex verifies that the original source of the review is Google.
Very professional and efficient, very happy with their cleaning workPosted on Google![]()
T RosalesTrustindex verifies that the original source of the review is Google.
Job was well done. Service was excellent.Posted on Google![]()
Mike UmbachTrustindex verifies that the original source of the review is Google.
Wash Dudes were professional right from the initial call and did a fantastic job cleaning our house. Highly recommended.Posted on Google![]()
Madeleine BeaulacTrustindex verifies that the original source of the review is Google.
Professionnal work! I highly recommend it to anyone!Posted on Google![]()
Jeremy GeurtsTrustindex verifies that the original source of the review is Google.
Sami and Tristan were great, good price, great service and quick communication and reliability. Will be using them again for sure.Posted on Google![]()
Kerry RobinsonTrustindex verifies that the original source of the review is Google.
Excellent company. Great communication. They keep you informed. Sami explains everything .. about the process and the products they use . Sami and Tristan came this morning. And worked hard. They did a super job !!! My house looks soooo good . I would definitely recommend Wash Dudes. KPosted on Google![]()
Tammy LevesqueTrustindex verifies that the original source of the review is Google.
Great to work with! Professional, polite and windows are clean.Posted on Google![]()
Marc RenaultTrustindex verifies that the original source of the review is Google.
Great outfit. Showed up when they said they would, got right to work and made a 40 year old house look like brand new!!! Hat off to the Wash Dudes...great guys and they do an excellent job!!!Posted on Google![]()
Samatar DaherTrustindex verifies that the original source of the review is Google.
Really happy with the service from Wash Dudes. They did a great job cleaning the exterior of my house and the difference is noticeable. The whole process was smooth, and they were friendly, professional, and took their time to make sure everything was done properly. Great service and great results. I’d definitely recommend them to anyone looking to have their home exterior cleaned.
Yes, when done correctly. We use a professional soft washing process, not high-pressure washing, for delicate roofing materials like asphalt shingles, cedar shake, and other sensitive roof systems. High pressure can strip protective granules, force water beneath shingles, and shorten the life of your roof. Our low-pressure roof cleaning method safely removes algae, moss, lichen, dirt, and organic buildup without causing damage.
Most roofs benefit from professional cleaning every 2–5 years, depending on the roofing material, surrounding trees, moisture exposure, and the amount of organic growth present. Homes with heavy shade, moss buildup, or visible black streaking may require more frequent maintenance to prevent deterioration and extend roof lifespan.
Those black streaks are often caused by Gloeocapsa Magma, a type of airborne bacteria that feeds on the limestone filler found in many asphalt shingles. Over time, it creates dark staining, reduces curb appeal, and contributes to roof deterioration if left untreated. Professional roof soft washing safely eliminates this growth at the source.
Yes. Moss can be extremely damaging to roofing systems if left untreated. It traps moisture against the roof surface, can lift and separate shingles, encourages rot, and increases the risk of leaks and freeze/thaw damage. Professional moss removal helps protect your roof and prevent costly repairs.
Not with the proper cleaning method. We use roof-safe soft washing techniques specifically designed to clean without damaging shingles or other roofing materials. Unlike aggressive pressure washing, our approach removes contaminants safely while preserving the integrity of your roof.
No, not delicate roofing systems like asphalt shingles. Pressure washing can cause significant damage, including granule loss, lifted shingles, water intrusion, and premature roof aging. We use low-pressure soft washing methods tailored to each roof type for safe, effective cleaning.
We professionally clean a wide range of roofing materials, including:
Each roof type is assessed individually to ensure the safest and most effective cleaning method is used.
Results vary depending on environmental conditions, surrounding tree coverage, moisture exposure, and roof material, but professional roof cleaning typically lasts 2–5 years. Preventative treatments and routine maintenance can help extend results even longer.
No. As long as we have safe access to the property, you do not need to be home for exterior roof cleaning services. Our team will complete the work professionally, and we’ll provide updates and electronic invoicing once the job is complete.
Yes. Preventative treatments can help slow the return of moss, algae, lichen, and organic growth, keeping your roof cleaner for longer and helping protect your investment.
Have more questions? We’re here to help!
Get your free, no-obligation quote.
Pick a time that’s convenient for you.
We clean safely and thoroughly.
Protect your home and enjoy peace of mind.
CLICK OR CALL TODAY FOR A FREE, NO-OBLIGATION QUOTE. WE’LL GET YOU ON THE SCHEDULE IMMEDIATELY WITH NO HASSLE.