Under the dishwasher. You will need to access the bottom front panel.
Under the sink. A corrugated hose runs from the dishwasher to either a garbage disposal or a direct pipe connection.
After clearing the blockage, run a heavy cycle with an empty dishwasher and a cup of white vinegar on the top rack to sanitize and remove any remaining odors. Your dishes will come out sparkling—and more importantly, dry.