This cleaner set provides intensive care for guitar and base frets. The rust of the fret creates friction with the strings and has a negative impact on performance. Polishing your fret with a special pad formulated with abrasive and polishing agent to remove rust and maintain its luster for a long time. How to use: Remove the strings and use the included fret guard to protect the fingerboard. Use the pad to polish the fret 10-15 times. Wipe off with a cloth to finish Caution: When polishing the fret, we recommend using gloves as dirt will seep out with the polish agent. Polish can stick to the finger plate and cause stains.