WAXIE Kleen-Slate Whiteboard & Chalkboard Clnr 19 Oz Can 12/Cs. Ready-to-use, clinging, foam aerosol makes any whiteboard or chalkboard look like new . Relieves eye strain by giving greater contrast and removing ghost images. Pleasantly scented, nonflammable and has a unique 360-degree valve to spray in any position. Sold by the case and the each. Twelve 19-ounce cans per case.