I am about to purchase a Model Y. Where I live we use rock salt and brine solution on our roads and highways 7-8 months of the year. After 5-6 years cars and trucks here start to show the signs of rust. In my communication with a Tesla rep, she stated they do not offer any rust prevention measures and if I were to use some it may void my warranty. People with older Tesla’s in colder climates, how has the body and underbody fared with extreme salt exposure? Thanks for your time and responses.