Roofs look great in the weeks and months following their installation. However, over time, they lose their shine as the elements act to wear down the roof’s material. Combined with the growth of algae, moss, and lichen, you’ll have a worn-out roof with lots of black streaks and discoloration in as little as five years.

In this scenario, you may conclude that you need to replace the roof to restore your property’s curb appeal. In reality, all you need is professional roof washing.

SmartWash is the leading name for roof cleaning in Knoxville, TN. We use our custom blend of roof cleaning solutions to restore your roof’s appeal, and our soft wash system will clean the stains from your roof without damaging it.

What Causes Roof Stains?

Asphalt Roof Cleaning

What Not To Do!

Smart Wash cleaned our large barn. Their service and work is top notch. I recommend them to everyone. They have done superb work on our multiple properties.... Great job well done!read more
Rashwan Mahfouz
Rashwan Mahfouz
1701912927
We use SmartWash for pressure washing and gutter cleanings at my multifamily property and they always do a wonderful job. They're quick to respond, schedule,... and invoice. Very efficient and no complaints. I will always use them and recommend them to others!read more
Veronica Nieves
Veronica Nieves
1701271165
We use Smart Wash yearly to get leaves and debris off our roof and to clean our home exterior, porch and driveway as needed. They always do a great job and... their prices are very reasonable.read more
Smart Wash arrived on time, did a great job and we were very happy with the work they performed for us. Would recommend them to anyone and would use their... service again.read more
Janet Buckner
Janet Buckner
1699216351
Exceptional work! They were on time, on budget and very accommodating. I would absolutely recommend Smartwash!
Rocky Henry
Rocky Henry
1699031260
Smart Wash did an excellent job. They were very professional and courteous. Everything looks really awesome. Definitely worth the money.
My husband and I spoke with Nathan over the phone and he sent a representative the same day to give us a quote for washing our roof and our cedar siding and... two sheds! Cameron who came to give us a quote was extremely helpful knowledgeable and professional and very kind! Later the same day Nathan from the office called us back and scheduled the cleaning for only two days later! The two technicians that came to do our cleaning were on time and very polite and knowledgeable and efficient! The young technicians were Jersey and a technician also named Cameron! The before and after was simply amazing! So bright and clean! We couldn’t be happier!read more
Sean McDonald
Sean McDonald
1697141914
They guys did a great job cleaning my patio and walkways. They showed up on time, were professional, friendly, very thorough and paid attention to detail. I am... very happy with the results. Thank you!read more
Anne Stallworth
Anne Stallworth
1695393329
Smart wash has been an awesome company to work with. The crew that came to my house did an excellent job. They went above and beyond in their work. I’m happy... that with the results. The only reason that I gave a 4 star review is because there were some confusion from the person who provided the estimate. For example, it wasn’t clear that additional services would be needed to do things like:- Performing an Acid wash to remove red clay stains.- Performing a Degreasing Was to remove oil stains or “deep” stains on concrete/driveways…however the fine print of their 3-stage concrete wash service does state this.- Performing an additional brightening wash to remove “tiger strips”/oxidized stains on gutters.Once again, I am happy with the services that the Smart Wash crew did perform.read more
Good service only took 2 hours and priced reasonably. Took a star off due to some weirdness: they started working on my neighbors house until I went out to... move them, their sales guy called me to schedule while they were at my house, and they got a significant amount of water under the garage door into my newly refinished garage (not a big deal but I had to clean all the muddy water).read more
Jason Waring
Jason Waring
1695049855
Very professional about their business. They let you know when they are on their way and they arrived on time. Presented themselves well and proceeded to... work... job well done.read more
Mike Maddux
Mike Maddux
1694793843
I expected a good job as I had SmartWash do my driveway once before. What I didn't expect was a great job. The entire exterior of my house looks fantastic! ... The men were great, friendly and professional. I have already given my recommendation to several friends. Thank you. I won't wait so long until the next time I call.read more
Jeannine Korth
Jeannine Korth
1692034801
Smartwash was a great service doing an excellent job.
Arnold Hickman
Arnold Hickman
1691405760
They do an exceptional job in a short amount of time. This is my only complaint. I don't know what this is. It wasn't there before it seems to be rust or... something. But if you can tell me what to clean it with I can try.See first picture.read more
Debbie Reagan
Debbie Reagan
1690926723
Found with internet search. Worked out great! Was easy to schedule and they did a good job.
Suzanne Wright
Suzanne Wright
1690557147
Excellent service with good follow up and delivery.
Kelli Doss
Kelli Doss
1690381108
My roof, driveway & deck look brand new!!! Very nice & professional employees--both. Jersey took care to see that everything was done to my satisfaction!
Susan Beaman
Susan Beaman
1690369900
They did a great job for us. Highly recommend them.
David Forsberg
David Forsberg
1689014129
Jersey & teammate were awesome! Explained all their plans r how t make my roof shine!!! Easy & happy!
Cindy wieland
Cindy wieland
1688050599
The team at SmartWash did a fantastic job on our home, walkway, and driveway. Professional service and work. Would highly recommend them.
Michael Schafer
Michael Schafer
1687461988
We were very pleased with the work done by Smartwash. They cleaned the roof, power washed the entire house including the carport and sidewalk. They showed up... on time and were extremely professional. The workers were very nice and kind. Our house which is 65 years old looks almost new and all the spiderwebs are gone.read more
martha shatley
martha shatley
1687356732
Very detail oriented, reliable, and focused on good customer service. Have used them before, too.
I mostly do all of my work on my house, lawn and cars because 95% of the time when I pay someone to do something the results are terrible and I end up having... to fix it myself anyway. However I am a bit older now and do not like getting on steep roofs. SmartWash is a rarity these days. They have do a good job, they are professional, they show up when they say they will, they answer the phone and respond to texts, and their price if fair. They cleaned the front half of my roof, took care to not damage my lawn, landscaping or my house, and the roof looks much better now.read more
Shane Frank
Shane Frank
1687020301
The crew of SmartWash were very professional, nice guys, and answered any question I had. They did an excellent job on my roof and protected all surfaces and... plants below.read more
Robert Packett
Robert Packett
1686861821
Always a great experience, from the organized cleaning, beautiful work and cleanup. Thank You !
Lila Holdenried
Lila Holdenried
1686844580
Great job!! My roof looks new and the team was very professional. Would recommend!!
Amy B
Amy B
1686257726
They showed up on time and did a very professional job of soft cleaning our house. They showed care to prevent any damage to anything. The house looked like... new afterward.read more
Mark Prater
Mark Prater
1685909053
The guys did a great job, the roof is looking new again
2nd Rodeo
2nd Rodeo
1685645657
An estimator came out and saw me the same day of my request. His estimate was understood by the crew that were cleaning the house two weeks later, and they did... an excellent job.For what they did in two hours, would have taken me an entire day. Not to mention they kept me off of ladders.I plan on using them at least every other year from now on.read more
mike foy
mike foy
1685535047
Job well done. They were able to make black streaked shutters look new again! Professional crew and very friendly. Well definitely use them again!
john cole
john cole
1685141325
Another really good experience with Smart Wash. They make everything very easy for you. They showed up on time, were very professional, offered up really good... advice for things we hadn't considered, and did a fantastic job of cleaning everything. We were blown away by the results. Wouldn't consider using anybody else!read more
Jason Lawrentz
Jason Lawrentz
1684966768
Jersey and Phil did a great job! Professional and great people as well. Highly recommend!
Mike Shubert
Mike Shubert
1684440694
Smart Wash did an excellent job cleaning our cabin. I would highly recommend their service and I would definitely use them again. A++
Brad Howell
Brad Howell
1684268248
Good cleaning. They got four stars because two bird’s nests were left & cushions on chairs were not removed before cleaning.
Susan Smith
Susan Smith
1683660459
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Ignoring roof stains can reduce your roof’s lifespan by up to ten years. Some of the leading causes of roof discoloration include those listed below. 

Black or brown stains on your roof signify the presence of Gloeocapsa magma. These air-borne algae feed on filled-in composite shingles and thrive in humid environments. Thus, you’ll first notice the growth from the northern parts of your roof. 

Rain transports the algae down the roof, creating the black streaks you’ll see. However, the rain never washes away the algae entirely. The algae colony will spread until your entire roof has the characteristic decay-like dark coloration.

Apart from the reduced aesthetic appeal, algae can affect your roof in other ways. Algae activity can make the shingles lose their ability to reflect heat, causing a rise in your home’s heating and cooling costs. Such roofs also deteriorate faster, so you’ll need a replacement sooner than expected.

Moss grows in damp and shaded environments. It absorbs moisture from the environment by establishing roots on the roof. Moss activity leads to roof degradation because the roots lift shingles. 

The combination of lifted shingles and moss growth will lead to mold. Eventually, your roof could have holes. Moss-covered roofs are also very slippery when wet. If your roof is under any shade, you should take active steps to prevent moss growth on your roof.

A roof lichen is a symbiotic organism formed from the relationship between fungus and algae. Unlike roof moss and algae, roof lichen is more challenging to remove. It is persistent, adhering tightly to the roof.

Professional roof cleaning is the only way to remove the lichen, including the embedded roots. Here at SmartWash, we have years of experience cleaning lichen from residential properties in the Knoxville, TN, area. After we complete the process, the lichen will not return for a long time.

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Roof cleaning is a service that most people don’t consider throughout a roof’s lifespan. However, in the last few years, more people are aware of the benefits of cleaning their roofs.
Unfortunately, homeowners looking for expert roof cleaning companies have to wade through many inexperienced roof cleaning businesses to find qualified experts. 

There is no state licensing requirement for cleaning companies in Tennessee. Therefore, anyone can claim to be a roof cleaning company. This lack of oversight is why you find some contractors that pressure wash roofs. The best way to avoid working with inexperienced companies is to choose companies with years of proven history.

At SmartWash, we are the leading name for roof cleaning in Knoxville, TN. With more than a decade of roof cleaning experience, we are not your average roof cleaning company. We have worked on thousands of properties and have many positive reviews from real people near you.

End your search for a roof cleaning company in Knoxville, TN, and book an appointment with us today.

Homeowners choose SmartWash for the following reasons.

When you contact us for a roof cleaning job, we’ll discuss the specifics with you and offer a quote. On the day of the project, you can expect the following: 

  • We will protect your landscaping, keeping the cleaning solution on the roof.
  • A staff member will keep your plants wet, diluting any overspray.
  • We will collect and dispose of cleaning agent runoffs as we work on the roof.
  • Our cleaners will use ladder standoffs, leaning the ladder against the roof instead of your gutters.
  • We will produce custom-made cleaning agents for your roof type after thoroughly inspecting the level and type of dirt across the surface.

Professionally washing your roof to remove algae, mold, lichen, mildew, and moss will significantly extend your roof’s lifespan and improve its aesthetic appeal. Call SmartWash today at (865) 205-2958 to request a quote for roof cleaning in Knoxville, TN.

Our region is notorious for its humidity and heavy rainfall, which is perfect for the growth of algae and moss on your roof. Regular upkeep banishes these unwelcome problems, maintaining your surface’s integrity and aesthetic appeal.

Many who visit our roof cleaning FAQs often wonder about the ideal frequency for cleaning sessions. It’s not a one-size-fits-all answer. Factors that affect this include:

  • Weather considerations
  • Type of roofing material
  • Surrounding trees and foliage
  • Age of the roof
  • Proximity to high-traffic or pollution-heavy areas

A good rule of thumb is to schedule a refresh every one to two years. If you want a specific schedule, we’re always open to consultations. We’re all about tailored solutions at SmartWash!

Our expert touch does more than just improve curb appeal. We help prolong your roof’s life by spotting potential issues and staving off damage. 


The last thing you want to deal with is a compromised roof that puts you at risk of water damage, structural instability, or expensive repairs. To put it in a nutshell, we clean today so you can save tomorrow.

If you’re looking at our roof cleaning FAQs and contemplating a DIY solution, we’re here to tell you it’s no easy task. You could end up damaging your exterior or even risk personal injury. 


When you leave this task to our proficient crew, we:

  • Follow safety measures to the letter
  • Utilize a specific moss removal and algae treatment
  • Apply gentle yet effective washing techniques to preserve roof longevity
  • Save you time and money, and perhaps, most importantly, provide you peace of mind

Finding a long-term partner in roof maintenance doesn’t have to feel as daunting as finding a needle in a haystack. Here are a few pointers to help you pick the cream of the crop:

  • Check the company’s standing in the Knoxville community by looking for online reviews and testimonials.
  • Ask for their licensing and insurance details to ensure you’re covered should any mishaps occur during a session.
  • Look for a crew that has extensive experience tackling various roof materials and uses the latest equipment.

Absolutely! At SmartWash, we’re big on being green. Our industry-recommended methods maximize water efficiency, and we exclusively use biodegradable cleaning solutions. 


We believe in a clean roof and a clean conscience, so rest assured that while we’re sprucing up your shingles, we’re doing our part to protect the planet, too.

When you put yourself in the shoes of a prospective buyer, first impressions matter. What’s more visible than your roof? Keeping it properly maintained sends a clear message that you’re a diligent property owner who pays attention to the details.


Even if you don’t plan to sell or rent anytime soon, it’s still a good practice to keep your roof clean. The money you can save on damage prevention alone makes it an investment that pays dividends in the long run.

When you overlook maintenance, it often paves the way for accelerated wear and tear. The seemingly harmless contaminants marring your roof can become the culprits behind costly repairs. 


Even the most minor structural weakness can rapidly escalate into full-blown problems like water intrusion and severe mold infestations. Why wait for these unexpected expenses when prevention is just a call away?

Roof cleaning can take several hours, though the exact timeframe will depend on factors like the size and condition of the roof.

Our roof cleaning FAQs section would be incomplete without discussing post-cleaning care. While our thoroughness ensures you don’t have to worry about immediate upkeep, it’s always wise to take preventive measures for the long haul.

Occasionally inspect the state of your roofing, especially after bouts of bad weather. Also, we recommend trimming any overhanging tree branches. The leaves and twigs they shed can clog your gutters and potentially cause damage.


Reach out to learn more!