Quartet Whiteboard Cleaner is specially formulated to erase and clean all whiteboard surfaces. For the best results, use this regularly to remove marker residue, dirt and grease which may cause whiteboard ghosting. This bottle also features a spray nozzle for a nice and easy clean application. You can use this on your whiteboard at home or school to erase marker residue, dirt and grease. You can use this regularly and it won't leave a residue. The bottle also features a spray nozzle for easy application. There is 500 mL in each bottle.