[68c10airstream]

Rusty 76, i live in the salty north and the glass on the outside gets what the industry calls rail dust. It's actually the snow plow's scrapper blade wearing down and leaving metal filings on the road. I can run my fingernails over it in the spring and can tell if it's there or not ( it's always present). I clay bar my whole car, trim and all and looks fantastic, especially the glass. I then use a paint sealant like wizards and the sheeting action last for a while. I also use rain-x orange washer solution and can tell where on the cat it spatters when i hose my car off in the winter. Oh, a friend retired from the county road commission (managed the snow plows) said he never takes hi old gto out until it has rained 3 times in spring first, to wash off the brown tint (rusty metal filings) from the roads. Once he told me that i noted the brown tinge in spring. Clay bar and paint sealant are the easiest products to use and give the nicest results