Dirt will not come off the LCD screen.
If the LCD screen becomes very dirty, wipe lightly with a soft cloth dampened with cold or warm water, and then wipe dry.
Note: Using chemical substances such as thinner, benzine, alcohol, chemical wipes, insect repellent, or sunscreen when wiping the LCD screen may cause the screen coating to come off.If the LCD screen coating comes off, it can be repaired.
If the issue is still unresolved, the product may need to be repaired.