At ordinary times, you can always see someone pointing a finger on a computer screen, making the screen look ugly. In fact, either a flat display or an LCD display can not be touched by hand, or use nails to draw a channel on the display. Touching the screen by hand will damage the display due to intense electrostatic discharge, and damage the coating on the display surface due to the grease on the hand. Note that the power cord and signal line must be unplugged when the monitor is cleaned and maintained to ensure safety. When wiping the shell, it is best not to use a wet cloth that will drip water. Be especially careful when cleaning the screen. Do not use organic solvents (such as alcohol and acetone). Do not use chemical cleaners as much as possible. Otherwise, the damage of the coating on the display surface will be irreparable loss. When wiping, you must use a soft cloth (such as the eye cloth or mirror paper) to directly wipe or spray the computer screen cleanser, and then use the soft cloth to gently wipe along the same direction.