Most scratches on a car door can be fixed by taking a few steps. First, wash the door to remove any dust or dirt. Then, use a toothbrush with rubbing alcohol to remove any residue. Finally, use a polishing cloth to buff out the scratch. If you have a scratched car door, there are a couple of things you can do to fix it. You can get the scratch repaired by a body shop, which is the best and most permanent solution. You can also use touch-up paint, which is a cheaper and less permanent solution.