Daily Monitor Thursday January 21 2021 Many times, road salt and other contaminants encourage corrosion in our cars. This means that dirty or salty water trapped somewhere in our car’s body makes that spot rust faster. Photo/ internet Summary The most common cause of rust is too much moisture resulting from continued exposure to rain or snow. Cars can also get rusty due to old age or not being properly covered. Here are some tips on protecting your car from rust. Advertisement Every motorist wishes to see their car new and shiny. However, over time, its body may start to rust.