Finish the following sentence with the best choice: How to ensure that a key stays in good working order?

Choices:
- When the key begins to show wear, buff it with a cloth to remove the excess metal and clean it with any alcohol
- When the key begins to show wear, buff it with sandpaper to remove excess metal and clean it with ethanol

Answer:
When the key begins to show wear, buff it with sandpaper to remove excess metal and clean it with ethanol