Green stains happen because of oxidation. Nail polish adds a protective layer against water and moisture. Plus, it can help keep your rings in good condition for longer. If you want to remove the polish, gently rub it with a wet wipe.
Make your coffee the night before and pour it into an ice cube tray. Freeze the coffee overnight, and in the morning, add the cubes to your cup with your favorite milk. This makes the perfect icy brew that’s not watery!