What cleaning solutions safely remove algae from stone armchairs?

Algae growth on stone armchairs can be unsightly and slippery, but harsh chemicals may damage the stone. Here are safe cleaning solutions to restore your furniture:

1. Vinegar Solution: Mix equal parts white vinegar and water. Spray on the algae, scrub gently with a soft brush, and rinse. Vinegar is acidic enough to kill algae without harming most stone surfaces.

2. Baking Soda Paste: Combine baking soda with water to form a paste. Apply to stubborn algae spots, let sit for 10 minutes, then scrub and rinse. This method is gentle yet effective.

3. Hydrogen Peroxide: A 3% hydrogen peroxide solution can bleach and kill algae. Spray, wait 5 minutes, then rinse thoroughly. Test on a small area first for colored stones.

4. Oxygen Bleach: Safer than chlorine bleach, oxygen bleach (like sodium percarbonate) dissolves algae without damaging stone. Follow package instructions for dilution.

5. Prevention Tips: Keep armchairs dry, trim nearby foliage, and apply a stone sealant annually to discourage algae regrowth.

Always test cleaners on an inconspicuous area first. For delicate stones like marble, consult a professional to avoid etching. Regular maintenance keeps stone armchairs algae-free and beautiful.