Green algae can be brushed clean from patios in as little as five minutes using a homemade solution of white vinegar and orange peel, according to home improvement expert Trevor Guilday, founder of EcoGen America.
Why algae thrives on patios
The changeable autumn weather creates ideal conditions for algae growth, with lingering moisture in the air and porous surfaces like natural stone absorbing water. This allows algae to flourish, especially after heavy rain, leaving patios with a green tinge that looks untidy and feels slippery underfoot.
The two-ingredient solution
Vinegar is naturally acidic and can effectively kill and remove green algae, while also acting as a weed killer. The oil in orange peels is a natural degreaser that strips away the waxy coating from algae, with the added bonus of leaving outdoor spaces smelling fresh.
Guilday told The Express: “The green algae on your patio will typically respond quite well to white vinegar as the mild acid will help dissolve the algae without requiring harsher chemicals. The simple mixture of equal parts white vinegar and four parts warm water makes my go-to homemade solution.”
He added: “If you would like to create a somewhat stronger solution by incorporating something natural, allow orange peel slices to soak in the vinegar for approximately seven days. Then, remove them prior to mixing with the vinegar and water. Once this is complete, apply the solution to the stained area and process in sections.”
Application and prevention
Guilday recommends spraying or pouring the solution on the area, then using a hard bristled brush with short, firm strokes so the solution penetrates the algae layer. Allow it to sit for five to ten minutes, then thoroughly rinse with clean water.
To prevent algae from returning, experts recommend sweeping regularly and avoiding long gaps between cleaning to prevent buildup of leaves and dirt. Michael Scott, founder of Lazy Susan Furniture, told The Express: “The key is to keep on top of things. Don't leave it too long between cleans and let muck build up. Take preventative measures such as applying a patio sealer to prevent dirt and algae buildup, sweeping weekly and cleaning with soapy water monthly.”
