Check the listing for details. D'ADDARIO Hydrate Fingerboard Conditioner 29.5 Ml. Condition: New. Listed at 6.87 USD. D'Addario Hydrate is the best way to restore the character of dark natural wood fingerboards on Allen stringed instruments. Hydrate's unique formula of oil and cleaning agents removes dirt and residue while moisturizing the fretboard. This prevents cracks and other damage that occurs when the fingerboard dries out. Hydrate is also very suitable for removing rosin from fretboards of string instruments. All of our items have a 30-day return policy without explanation. Notes, reading and software are excluded from the exchange. The General Terms and Conditions of Zoundhouse GmbH & Co. KG apply. When purchasing multiple items: Add the items to your shopping cart and select “Request total from buyer” at the top right. If you intend to buy multiple items: put them into your shopping cart and.