Hydrate by D'Addario is the ultimate treatment to restore the character of dark, natural wood fingerboards on all stringed instruments. Hydrates unique formula of oils and cleaners removes dirt and grime while restoring moisture to the fretboard, preventing cracks and other damage that can happen when a fingerboard becomes dry. Hydrate is also excellent for removing rosin from bowed instrument fingerboards. Cleans and Conditions dark natural wood fingerboards Unique formula removes dirt and grime Restores natural moisture to fretboards preventing drying, cracks and other damage Will not cause build-up Easy to use spray bottle From hydrating emollients to our fret polishing system, our rejuvenating fingerboard products will keep your instrument playing like new.