I am trying to clean up the stainless sections of my 69 chambered exhaust system and have a couple questions. Does anyone know if the factory chambered sections are made of stainless? The reason I ask is because there are some scattered spots of very light suface rust on mine. How can this be if they are stainless? This exhaust system is probably as old as the car and they are obviously made out of some type of rust resistant material. Is it possible for stainless steel to eventually rust? Can stainless steel be sandblasted and/or chemically stripped and still retain it's no rust characteristic? My tailpipes are heavily coated with 30+ years of road gunk, undercoating, and I have tried cleaning them with lacquer thinner but it just won't come off. I am going to have to resort to something more agressive. My knowledge of stainless steel properties is not that good and I am sure there are various grades of it. Not sure if stainless steel is just a coating that is put over regular steel or if it is solid stainless all the way through. Any advice on how to tackle this would be much appreciated.