I have been driving my 2002 V6 Mustang now for over 2 years here in the New England snow and salt. I have put over 18,8xx miles on it since I bought it brand new. What I do is I go to the car wash and spray my car thoroughly underneath the undercarraige areas and also all around the exterior. I have driven in many snowstorms and in the salty roads up here and the salt makes the car look all white. I just spray my Mustang with a high pressure gun at the car wash to get all the salt off. I never take it thru the cloth or brush car wash. When the weather gets warmer out, I pay a detailer to detail my Mustang. I usually detail my car 2 to 3 times per year depending on how bad it looks. You have to understand that no matter what, as long as you drive your car in the salt during the wintertime, there will come a time when your vehicle will start to form rust on it. This is unavoidable. Some cars show rust earlier than others. The only thing that you can do is what I do to try to prolong the life of the paint and sheetmetal on the vehicle so it will not rust too soon. With age though, rust will definitely start to show up on the sheetmetal. I am not really sure WHERE the first signs of rust will start showing on the 99-04 body styles. I have yet to see any 99-04 Mustangs with rust on the exterior of their body or anywhere on their undercarraige. Does anybody in here know where the 99-04 Mustangs are prone to showing the first signs of rust on their body and/or undercarraige/frame? I would like to know more about this. Nobody has ever raised this question in here before. Thanks.