Slide it out completely so you can access the drain area.
Sprinkle ½ cup baking soda into the drain hole, then pour 1 cup white vinegar. Let it fizz for 10–15 minutes to break down grease and soap scum. clean drain dishwasher
Most dishwashers have a cylindrical or flat filter at the bottom. Twist it counterclockwise and lift it out. Check your manual for exact location. Slide it out completely so you can access the drain area