(12) 20 oz. Cans. Chalkboard Cleaner, eliminates glare, water base 60. TOP is a water-based product specially formulated to clean all types of chalkboards, including the modern mark and wipe use boards of today. Its clinging foam makes cleaning vertical surfaces a breeze. Does not leave a film. A combination of solvents, surfactants, and emulsifiers in a water base are joined together to produce this excellent formula.