Rainex. Get the original - not the spray bottle. I have used it on cars and boats for years now. On the boat I apply before each trip. With the car every time it gets a bath. I certainly would not be putting anything like steel wool near my glass. If the glass has been damaged by salt it can be professionally polished but it would depend how thick it is and how deep the damage goes. We have had windows done that have been damaged during sandblasting and the results were pretty good - but the glass is half an inch thick to start with.