Green algae growth on house siding is a common problem — especially on shaded walls or in humid climates. In the photo you showed, the siding is streaked with green growth … exactly what happens when algae thrives on damp surfaces.
🌿 What Is Algae on Siding?
Before we dive in, let’s clarify what you’re looking at:
A dramatic before-and-after example showing heavy green algae on siding and a clean, restored exterior after proper cleaning.
Algae is a simple plant organism that thrives in moisture. On home exteriors, it looks like:
- Green streaks running down siding
- Light green patches in shaded spots
- Slimy, organic buildup over time
This buildup not only looks bad but can also trap moisture and lead to stains or long-term material damage if ignored.
🧼 What Causes It?
Common reasons algae grow on siding:
- Constant humidity
- Shaded walls that don’t dry quickly
- Nearby trees or vegetation blocking sunlight
- Water runoff from gutters
- Organic debris left on siding
This is why algae is often most noticeable on north-facing walls or areas that stay damp.
🧽 Simple Ways to Get Rid of Green Algae
Here are some effective cleaning methods you can try:
✅ 1. Oxygen Bleach and Water
This is one of the gentlest but most effective cleaners.
- Mix oxygen bleach (like sodium percarbonate) with water
- Apply with a sprayer
- Let it sit for 10 minutes
- Rinse with a garden hose
This solution breaks down algae without harming plants nearby and won’t discolor your siding.
🪣 2. Vinegar Spray Method
For a natural DIY approach:
- Mix equal parts white vinegar and water
- Spray on affected areas
- Let it sit 15–20 minutes
- Scrub lightly and rinse
The acidity in vinegar breaks down the algae at its base.
🧼 3. DIY Detergent Clean
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