Green Algae on Vinyl Siding in Clark County: Causes and Cleaning
If one side of your house has a green or gray film on the siding, you’re not alone. Green algae is one of the most common things we see on vinyl siding around Clark County. The good news is that it cleans off. Mountain View Pressure Washing And Softwash uses a gentle soft wash to remove algae from vinyl siding without damaging it, and we take care of your plants along the way.
If the algae has already spread across the house, our house soft washing service covers the whole exterior.
What Causes Green Algae on Vinyl Siding
Shade and Moisture
Algae loves damp, shady places. The north side of a house, walls near tall trees and spots that stay wet after a rain usually turn green first.
Trees and Organic Debris
Pollen, sap and bits of leaves land on siding and give algae something to feed on. Homes under firs and maples often see more growth.
Sprinklers and Gutters
Sprinklers that hit the house, or gutters that overflow, keep walls wet and help algae spread.
How We Clean Algae Off Vinyl Siding
Soft Wash Treatment
We apply a cleaning solution at low pressure that breaks down the algae, then rinse it away. It gets the green out of the texture of the siding instead of just knocking off the top layer.
No High-Pressure Blasting
High pressure can crack vinyl, loosen panels or push water behind them. Soft washing avoids that.
Protecting Your Landscaping
Your plants matter to us too. Dakota pre-wets your landscaping before he starts, rinses it during the cleaning, and post-wets it again when he’s done.
Tips to Slow the Green From Coming Back
- Trim branches that hang close to the house.
- Adjust sprinklers so they don’t spray the walls.
- Keep gutters clear so water doesn’t spill down the siding.
Referral Offer
Referral offer through Saturday, October 31, 2026: Refer a neighbor, and you both get a free downspout flush. (A full downspout flush is normally an add-on that isn’t included in regular gutter cleaning, and you don’t need to be home for it.)
Serving Vancouver, WA and All of Clark County
Our wet fall, winter and spring make algae a year-round topic here. Whether you live in Vancouver, Camas, Washougal, Ridgefield, La Center or Battle Ground, Mountain View Pressure Washing And Softwash can come out, take a look and give you a free estimate for cleaning your vinyl siding.
Frequently Asked Questions
Is green algae bad for my siding?
It’s mostly a looks problem at first, but left alone it can stain and make surfaces slippery around entries. Cleaning it off keeps your siding looking fresh and easier to maintain.
Can I just use a pressure washer myself?
We don’t recommend high pressure on vinyl. It can crack panels or drive water behind them. A soft wash cleans the algae without that risk.
Will the cleaning hurt my flower beds?
Your plants matter to us too. Dakota pre-wets your landscaping before he starts, rinses it during the cleaning, and post-wets it again when he’s done.
How long does the clean look last?
It depends on shade, trees and moisture around your home. Dakota will point out anything that may be helping algae grow so you can slow it down.
What does vinyl siding cleaning cost?
We give a free estimate based on your home’s size and how much algae is on it. Call (360) 852-5589 to set one up.
Get a free estimate – call (360) 852-5589
Tired of the green? Let’s get your siding clean again. Call Mountain View Pressure Washing And Softwash at (360) 852-5589 for a free estimate.
Mountain View Pressure Washing And Softwash is a WA L&I contractor (#MOUNTVP750KB), and every job comes with our 100% Satisfaction Guarantee.