Smooth leather should be treated with shoe polish. It is important to ensure that any dirt is removed from the shoe beforehand. Use a soft sponge or cloth and gently wash the dirt off the shoes. Use water if they are very dirty, but avoid getting the shoes drenched. Then the shoe must dry well, and then the shoe polish is applied with a soft cloth or sock. Let the shoe polish be for at least an hour and then polish. The shoe polish must match the leather and color.