The Monster should be safe - just make sure you're gentle - particularly when cleaning the bezel (the area around the screen), and using a clean microfiber that is reserved ONLY for the television.
I've used various screen cleaning products that were designed for LCD use, and the secret - if there is one - is a gentle touch.
I just purchased a new LN52B750 and I am wondering what to use to clean the screen with. I have purchased the Monster screen cleaner but have been a little apprehensive to use it. I have been told only to use water to clean it with and this is also what is stated on the cleaning cloth that came with the set. I have also heard that the Monster screen cleaner works great and will not hurt or damage anything. Which one is correct? Is the Monster cleaner safe to use? I absolutely love this set and do NOT want to damage it.