It starts as a faint green haze. Then one day you step back, look at your house in the sunlight, and realize your siding has taken on a swampy tint. Green algae has a way of creeping up quietly—especially on the shaded side of your home—making everything look older and duller than it really is.
I was fully prepared for a weekend of scrubbing with a stiff brush when my neighbor leaned over the fence and shared a surprisingly simple trick.
“No scrubbing,” he said.
And he was right.
Why Green Algae Builds Up on Siding
Algae thrive in damp, shaded environments. If your home has:
Trees casting constant shade
High humidity
Poor airflow
Frequent rain
…you’re basically offering algae the perfect place to settle in.
Vinyl and painted siding are especially prone to that green film because they hold moisture just long enough for growth to spread.
The Zero-Effort Cleaning Solution
Here’s the trick my neighbor swears by—and now I do too.
What You’ll Need:
Outdoor bleach (or regular household bleach)
Water
A garden pump sprayer (or hose-end sprayer)
A garden hose
That’s it. No ladder scrubbing. No elbow grease.
The Simple Method:
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