I doubt you'll do any damage with your polisher, PlastX and an orange pad. If that doesn't remove the damage your looking to remove, and you proceed to something stronger, and also move to a more aggressive machine, then sure, you will eventually get to a point where you may cause damage to the protective coating on the lens. But the point here is what will it take to make your headlight lens clear like new again, correct? Try the PlastX and the orange pad without worry. If that doesn't solve your problem then it's likely you have more damage to the lens than you originally thought. And it'll be time for something more drastic. But lets not get ahead of ourselves.