To maintain the polished finish of your Koinob Knob & Drawer Pull, regular cleaning with a soft, damp cloth is recommended. Avoid using abrasive cleaners or harsh chemicals as these can damage the brass material and diminish the shine. For deeper cleaning, a mild soap solution can be used to gently wipe the surface, followed by drying with a clean, soft cloth to prevent water spots. Additionally, applying a thin layer of quality brass polish occasionally can help preserve the lustrous finish and protect the metal from tarnishing. Always test any cleaner or polish on a small, inconspicuous area first to ensure it does not adversely affect the finish.