4, Whiteboard use after a period of time, the Pan appeared strokes or ash, is a normal phenomenon; at this point do not directly wipe the surface with a rag (wiping cloth to avoid clutter, hard objects, wipe when you scratch the surface), with a whiteboard cleaners and cotton cloth or paper towel to clean.

                            Practices are: whiteboard cleaners, spray on the Board first, after using a soft, clean cotton cloth or paper towel wipe carefully with a hair.

5、平常请勿将他物靠在板面上，以免碰伤板面