Although companies market "glass polish," the stuff pretty much doesn't work.
Also, there are companies which service windshields at car dealers. While they're good for injecting resin into a crack to prevent it from spreading -- they don't do anything to fix optical imperfections like media blasting and pitting.
You could try something somebody else recommends -- but don't hold out too much hope. Even light scratching means polishing a piece of tempered glass down to the point where they blend in. Do that by hand -- even with the assist of power tools -- is next to an impossible task.