Chemico, the pink household cleaner that is over 50 years old. Get the original paste pot, not the liquid bottle. Very popular in South Africa, it is a British product. Twenty years ago it was the only thing that would not void the warranty on my mom's stainless steel pots. A friend uses it as final rubbing compound on newly painted car panels, better than the finest rubbing compound. Never used it on a screen myself, but it will not attack the plastic unlike many chemicals.