LG Dish Washer - Why does a bad smell come from a dish washer?

Why does a bad smell come from a dish washer?

  Cause

        ■ When a dish washer is not used for a long period of time in a closed area,

            a bad smell can occur due to food odor and residual water.

  How to fix

      ① Leave a door open s lightly after a cycle is complete to prevent an odor.

      ② If a dish washer will be not be used for a long period of time, please remove residual water under a filter. 
            To use again, first run a cycle with detergent and 30cc of vinegar without a load to remove a odor.

                                           Ventilation