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Cerium oxide is an important component of glass polishing powders and phosphors used in screens and fluorescent lamps. It is also used in the flint (actually ferrocerium) of lighters.
This is why I always use a screen protector. Sometimes just adding a screen protector is enough to hide small scratches. If not and your daring there are glass polishes you might try like Cerium Oxide. Mix it with just a little water sot it not clumpy and not runny and use that to buff out the screen.