What are the best methods for removing graffiti from polished stone outdoor bins?

Removing graffiti from polished stone outdoor bins requires careful methods to avoid damaging the stone's finish. The best approach starts with immediate action, as fresh graffiti is easier to remove. Begin by gently rinsing the area with water to remove loose debris. For water-based paints, a specialized, pH-neutral stone cleaner or a paste made from baking soda and water can be effective. Apply it with a soft cloth or brush, scrubbing gently in a circular motion. Always test any cleaner on a small, inconspicuous area first. For more stubborn graffiti, a low-pressure wash (under 1000 PSI) with a mild detergent may be necessary, but avoid high-pressure washers which can etch the polished surface. In severe cases, consult a professional stone restoration expert who can use poultices or specialized solvents designed for polished stone. The key is to use non-abrasive, non-acidic cleaners to preserve the stone's sealant and glossy appearance. After cleaning, rinse thoroughly and consider applying a quality stone sealer to protect against future vandalism.