Planet Waves Lemon Oil is a cleaner and conditioner formulated to remove dirt, grease, and wax buildup from unfinished wood like most fret boards. Lemon Oil also conditions unfinished wood to resist dryness and extend the life of your instrument. It comes in a 2 ounce plastic bottle. Use Lemon Oil periodically usually when you change strings to clean and hydrate your fret board to prevent drying out.