This is my first white color vehicle and I have not seen this issue on other silver color before. The vehicle saw its first snow this winter and now it has small (1/8" in daimeter) rust color marks on the tailgate and on the bottom part of the doors (even on plastic parts of the vehicle). I tried removing it and are really hard to remove. Even tried the turtle wax bug remover. If anyone can help me with an easy way to remove those marks.