Johnny Tsunami Answers The Most Common Exterior Cleaning FAQs

We believe the best customers are informed customers. At Johnny Tsunami, we’re not just here to clean but also to educate our customers. Below you’ll find answers to the most common questions we get from local homeowners and business owners about exterior cleaning, roof care, gutter maintenance, solar panel cleaning, pricing, and seasonal protection in the Pacific Northwest.

“These guides help you make smart decisions, understand service expectations, and know exactly what to expect when you book exterior cleaning with us.”

Helpful Answers. Straightforward Advice

Soft washing is a low-pressure cleaning method that uses specialized cleaning agents to break down grime, algae, and moss. Pressure washing relies on high-pressure water to blast away dirt. Pressure washing is ideal — ideal for concrete and hardscapes but not safe for concrete and hardscapes, but not safe for roofs, windows, or siding. Soft Washing:
  • Safe for shingles, vinyl, stucco, and older surfaces
  • Extends surface lifespan
  • Kills mold, mildew, and algae at the root
Pressure Washing:
  • Best for patios, driveways, brick, and walkways
  • Can damage paint, shingles, and seals if used improperly
At Johnny Tsunami, we assess the material and use the correct technique — not a one-size-fits-all approach.

Absolutely — and in fact, it’s the preferred method. Our biodegradable cleaning solution is designed to kill and remove moss, mold, and mildew without causing harm to your roofing materials, paint, or landscaping. Unlike pressure washing, which can void warranties and strip surfaces, soft washing is gentle and thorough.

Our technicians follow industry best practices, stay OSHA-compliant, and perform a pre-clean walkthrough to ensure everything is protected and prepared.

Eventually — yes. But our professional treatment significantly delays regrowth. Most roofs stay clean for 12–18 months depending on your tree coverage, weather exposure, and drainage.

We recommend an annual maintenance plan for moss prevention, gutter flow control, and touch-up treatments. We also provide guidance on trimming overhanging trees, clearing roof valleys, and keeping surfaces dry to slow moss growth.

Unless your roof has structural issues or widespread shingle failure, cleaning is almost always the better first step. Soft washing removes years of buildup, reveals the true condition underneath, and helps you avoid premature replacement costs.

We’ll inspect and advise you honestly — if it just needs cleaning, we’ll say so. If you need a roofer, we’ll point you to trusted partners.

Spring and fall are ideal:

  • Spring = remove winter debris, prep for pollen and growth
  • Fall = remove leaves, prep for rain and freezing conditions

We clean year-round, weather permitting. Our team knows how to work safely in wet conditions and can flex around your schedule.

The PNW is a moss paradise:

  • Constant rain and cool temps
  • Tree shade and minimal sun exposure
  • Leaves and needles collecting moisture

Unchecked moss can damage shingles, trap moisture, and lead to leaks. Cleaning it off and applying preventative treatment is the smartest way to protect your roof and gutters from long-term damage.

Here’s what we recommend:

  • Gutters: Twice yearly (Spring and Fall)
  • Siding: Once a year minimum — more if you have trees or algae
  • Solar panels: Every 6–12 months for optimal efficiency

Regular cleaning keeps your home healthy, your curb appeal sharp, and your energy savings intact. We’ll help you build a schedule that fits your home and your goals.

Our customers Reviews

Linda Braun profile pictureLinda Braun
02:32 03 Mar 26
Good work, Dylan! Dylan's work definitely shows. Both the house & shed roofs are so clean now. The house's 30 year roof is 20 years old. As I looked today, it looks like a new roof! And he cleaned ALL the windows. It's so nice to look outside through them.
Sue B profile pictureSue B
19:19 27 Feb 26
Michael was polite, professional and diligent. He was a good communicator and did a fine job of roof/gutter/window cleaning at our cabin in the woods. Highly recommend.
Keith profile pictureKeith
00:35 27 Feb 26
Prompt
Nice Service Tech
Emily Faye profile pictureEmily Faye
19:58 26 Feb 26
my tech was Michael C. and did a excellent job
Cassy Cantu profile pictureCassy Cantu
17:00 25 Feb 26
Johnny Tsunami has serviced the roof and siding of my house for years. If they weren't an exceptional business I wouldn't use them again nor write this review. JP listened carefully to what I wanted and then assessed what the house did/didn't need. Within a week Alex spent 4+ hours meticulously blowing, scraping, and soft washing the roof. He did this in very cold lightly raining weather! The roof looks great and its life has been extended.
Sue King profile pictureSue King
21:23 24 Feb 26
The gentleman named Jack. Did an amazing job for us. Our roof looks new again. All the peaks in the roofs had moss control on them and all the leaves and branches were cleaned off and taken away. Very pleased with this young man’s service. Thank you Jack!
Tracy Minick profile pictureTracy Minick
00:34 24 Feb 26
Very pleased with our roof cleaning, moss treatment and gutter cleaning
Michaele Stoll profile pictureMichaele Stoll
18:38 21 Feb 26
I had my interior and exterior windows and sliding glass doors cleaned yesterday and am extremely pleased with the results. Ty J. did a fabulous job. He arrived on time, was friendly, courteous and professional. I will be hiring them again to do my siding and deck cleaning. I highly recommend Ty and Johnny Tsunami.
Jim Fitch profile pictureJim Fitch
15:43 19 Feb 26
They did a great job cleaning and treating my very long overdue roof.
Irene Hecht profile pictureIrene Hecht
05:00 19 Feb 26
Did a great job! Arrived on time, explained what he was going to do and cleaned my roof and windows!
Christy Arneson profile pictureChristy Arneson
22:37 18 Feb 26
Dylan and Dalton did a super thorough job cleaning my roof, gutters, windows, and decks. They arrived on time, worked quickly, and took me through a final walkthrough to make sure everything met expectations. Great work!
Jean Tracy profile pictureJean Tracy
22:26 18 Feb 26
The service and attitude of Laura and Bobby were excellent (front end). It didn’t feel like the service end was 5 star.

Let’s Get Your Home Sparkling Again

It’s time to say goodbye to dirt and moss and hello to a cleaner, brighter home! From roof cleaning to pressure washing, we’re here to help.