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

Michelle Corey profile pictureMichelle Corey
14:24 10 Apr 26
As a service organization, Johnny tsunami is the best I’ve used in a while. Great communication. They do what they say they’re gonna do and most importantly they are responsive to the customer needs.
barbara mcmahon profile picturebarbara mcmahon
14:22 10 Apr 26
Ty was thorough and very pleasant. My second year with Johnny Tsunami and I'm very pleased.
Art Heath profile pictureArt Heath
20:10 08 Apr 26
Dylan was absolutely awesome. Very professional but concerned thatbI was pleased with the work he performed
Charles Kondo profile pictureCharles Kondo
15:29 08 Apr 26
Had concrete tile moss removal. After some minor scheduling issues the work was completed, cleanup done and with a very competitive price.
Terri Ross profile pictureTerri Ross
23:59 07 Apr 26
Shawn did an excellent job, everything is sparkling and clean. Thanks so much.. Terri
Robin Pearson profile pictureRobin Pearson
17:03 07 Apr 26
Losi pressure washed my driveway, porch, and patio furniture. They did a great job! I have some drainage issues in the driveway area, and they took the time to wait for the water to drain. Previous companies have left me with a large muddy pit at the end of the driveway. It took a full day, and they stayed late and finished everything. Highly recommend this company!!
Colleen Taylor profile pictureColleen Taylor
16:44 07 Apr 26
Professional, timely service.
Colleen Hogan-Taylor profile pictureColleen Hogan-Taylor
19:21 06 Apr 26
Professional, timely service.
Denise Giuntoli profile pictureDenise Giuntoli
05:45 04 Apr 26
They were 4 hours late and then all they could say was Sorry. My gate was left open, and the hose was not reattached. The only saving grace was the guy was nice. I would not recommend them.
Anne Huffington profile pictureAnne Huffington
23:11 02 Apr 26
Quentin Lopez with Johnny Tsunami kept me informed and did great work!
Darryl Aiello profile pictureDarryl Aiello
21:36 02 Apr 26
Wyatt was nothing but professional. They did an excellent job and cleaned the area after they finished then hauled away the by product.
Jeffrey Keldsen profile pictureJeffrey Keldsen
21:05 02 Apr 26
Whyatt M. and Darryl arrived early and were extremely professional. They listened to my needs and provided excellent advice.

The work was performed on-time and they even added a couple additional items that I needed free of charge.

Thanks for a job well!

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.