Average life span: 9 to 12 years
What to do: Be mindful of what you put in it. Leave out small pieces that can get lodged in the drain and make sure everything is dishwasher-safe. Use a powdered detergent, because gels can cloud dispenser and glasses. Spend the few dollars on a rinse aid, such as Jet-Dry, every month or so.
Inspected and cleaned: Every 2 to 3 years.