Green algae on siding is something many homeowners deal with, especially if you live in a humid climate or your home sits in the shade for most of the day. Over time, those green streaks can make your house look neglected — and if ignored, they may even contribute to surface damage.
For years, I tried everything. Pressure washing. Store-bought cleaners. Scrubbing brushes. Every method worked… but only after a lot of effort.
Then my neighbor shared a simple trick that completely changed the game. No heavy scrubbing. No expensive products. And surprisingly, almost no physical effort.
I was skeptical — until I saw the results myself.
Here’s how it works.
1. The Surprisingly Simple No-Scrub Method
The secret isn’t a special tool or a commercial cleaner. It’s a basic homemade mixture applied with a garden sprayer.
Instead of scrubbing algae off the siding, this solution kills it and loosens its grip on the surface. Once sprayed on, you simply let it sit and do the hard work for you.
No ladders. No intense scrubbing. No pressure washer required.
2. Why Green Algae Grows on Vinyl and Painted Siding
Algae loves moisture and shade. That’s why the north side of your home or areas beneath large trees often show the worst buildup.
Vinyl and painted siding tend to trap moisture, creating the perfect environment for algae spores — which are always floating in the air — to settle and grow. Over time, the algae feeds on moisture and organic debris, forming those familiar green patches.
Understanding this helps you not only remove algae but also prevent it in the future.
3. The Simple Cleaning Mixture You Actually Need
The beauty of this method is how basic the ingredients are. You likely already have everything at home:
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1 gallon of water
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1 cup of white vinegar
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1 tablespoon of dish soap
That’s it.
The vinegar’s acidity kills the algae, while the dish soap helps the mixture spread evenly and cling to the siding so it can work effectively.
No harsh chemicals. No expensive specialty products.
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