There are a few things you can do to remove scratches from a black car. The first is to use a scratch remover. This is a device that removes the scratch marks from the surface of the car. The second is to use a hairdryer. This will heat up and cause the hair on the car to come out in waves, which will help remove any scratches. Finally, you can use a vacuum cleaner and bucket to clean the area where the scratch was made.