The LCD screen of your computer becomes so dirty that you can hardly identify what you are typing. 
Use some household ingredients to keep a clear, clear image on the LCD screen without blurring or scratching it. 
What you need is: distilled water isopropyl a spray bottle nose soft cotton clothWhite vinegar (optional)
Step 1: turn off the display to turn off the LCD display. 
Step 2: mix the solution to mix 50% of distilled water and 50% of ethanol in the spray bottle. 
Step 3: spray cotton cloth with solution. 
Do not spray the solution directly onto the computer screen. 
Step 4: wipe the screen with circular motion. 
Step 5: let the screen dry before re-opening the display. 
Trivia: The LCD screen consumes only 40% of the electricity using a conventional cathode ray tube display.