Credit:  David Horii

If your dishes sit before you start the dishwasher, run a "rinse and hold" cycle until you're ready to wash. To clean the whole machine, run an empty cycle with two cups of white vinegar (a natural odor absorber and neutralizer) instead of detergent. Remember that your dishwasher is not a garbage disposal: You can prevent odors by rinsing food off before you load.