Intro: Green patios are caused by algae — easy to clean and prevent.
1. Brush the area
A stiff brush removes most algae.
2. Use warm soapy water
Scrub and rinse.
3. Improve drainage
Standing water encourages algae.
4. Let more sunlight in
Trim plants that shade the area.
5. When to pressure wash
Use low pressure to avoid damaging the slabs.
Summary: Green slabs are caused by algae and moisture — regular brushing prevents it.