Fretboard cleaning is the process of removing dirt, grime, and oils from the fretboard of a stringed instrument, such as a guitar or bass. Regular cleaning helps maintain the instrument's appearance and playability, ensuring that the strings can slide smoothly over the frets. To clean a fretboard, musicians typically use a soft cloth and specialized fretboard cleaner or lemon oil. It's important to avoid using water or harsh chemicals, as these can damage the wood. After cleaning, applying a conditioner can help protect the fretboard and keep it in good condition for years to come.