Like any coffee maker, espresso machines require regular cleaning to ensure optimal operation. In fact espresso makers can be particularly sensitive to maintenance neglect. In addition to coffee brewing, some of these products have systems for steaming milk and grinding beans. Each subsystem calls for specific steps to keep them dirt and grime free. The portafilter, the main brewing chamber, should be hand-washed with soap and hot water daily. And to make the task easier, run a water-only brewing cycle before and after each espresso shot you pull (brew). You'll likely have to clean the water shower screen weekly too. For more details be sure to check your machine's manual (PDF) for cleaning instructions specific to your brewer.