Soften your dishwasher water with a water softener. Keeping the water soft could expand the life of your dishwasher. A home water softener can be plumbed to your dishwasher, so your dishes will be washed with soft water.
Keep your water hot, between 130 to 150 degrees, which can be adjusted on your home hot water heater.
Use a rinse agent which can be purchased and added to your dishwasher, or as a alternative, pour 1 1/2 cups of white distilled vinegar in the bottom of your dishwasher with each load.
Clean your dishwasher once a month with a dishwasher cleaning product that you will run through the empty dishwasher.