Oak cleaner and refresher. Oak Restorer-HW is a blend of buffered carbonate, bicarbonate and proprietary surfactants. It was developed to remove tartrate crystals, wine color, protein and organic soils, and to clean barrels using hot water. This fast dissolving formulation contains 100% active components for advanced cleaning action compared with carbonates alone. By thoroughly cleaning the internal contact surface you can extend the working life of your oak (barrels and staves).