How do I clean my samsung series4 flat lcd...

First of all do not use paper toweling or other paper products as they can scratch the screen. A simple eco-friendly cleaning solution can be made using plain white vinegar & water in a 1:1 mixture. Avoid commercial glass cleaners as they are very harsh. Do not spray the solution on the screen directly as it could run down inside the screen and cause serious damage. Apply the solution to a micro-fiber cloth and very gently wipe the screen clean. The LCD screen is quite fragile so apply very light pressure. You can use this same technique on virtually any screen.