How do I perform routine maintenance to prevent odors in the dishwasher?

Use affresh® dishwasher and disposer cleaner once a month as part of routine maintenance to help avoid odor or odor-causing residue. Place one affresh® tablet in the main detergent tray and another in the prewash tray or the bottom of the dishwasher, then run the most aggressive cycle with no dishes inside. You can also run a vinegar rinse by placing 2 cups (500 mL) of white vinegar in a glass on the bottom rack and running a normal cycle without detergent. (Page 9)