I was always told to use Soap and Water when cleaning your windshield and face shield. But have nasty tough to get off stuff on my windshield. I did some research and found a couple of products but have to get them on the internet like amazon. Wanted to hear your thoughts on what is good or not good to use. The products I found were Plas-tec, Craftics 20/20, Plexus, Meguiar's mirror Glaze, Novus plastics Cleaner. A few choices here but only one or two I found on amazon. What have you used that I may be able to get local?