Seeing green algae coat your beautiful stone benches can be frustrating. Don't worry—it's a common issue in damp, shady areas. Here’s your practical guide to getting rid of it and keeping it away.
First, safety: wear gloves and ensure good ventilation if using cleaners.
For a gentle, natural clean, mix equal parts white vinegar and water in a spray bottle. Soak the algae-covered areas and let it sit for 15-20 minutes. The acidity breaks down the algae. Scrub with a stiff-bristled brush (not wire, to avoid scratching) and rinse thoroughly with a garden hose. For tougher growth, a paste of baking soda and water applied before the vinegar can boost the cleaning power.
For severe infestations, a pressure washer can be highly effective. Use a wide fan tip and keep the pressure moderate to low to avoid etching or damaging the stone. Hold the nozzle at least 12 inches away and work in sections.
To prevent algae from returning, consider applying a penetrating stone sealant after the surface is completely dry. This creates a water-repellent barrier. Also, improve airflow and sunlight exposure around the benches if possible by trimming nearby foliage.
Regular maintenance, like a quick sweep and occasional mild wash, will help you enjoy your clean, algae-free stone benches for years to come.