You didn't mention "which" super-automatic. But basically, what everyone is saying is true, cleanliness is next to godliness when it comes to espresso machines...especially super-auto's. For the commercial machines I sell I recommend a short hot water clean cycle after every third drink, and two or three cleaning tablets per day depending on volume. If you can access the group head screen, wipe it off daily with a clean damp cloth.
You don't want to go over board on those tablets Dave. Using to much machine cleaner can cause some very negative effects. Using to much can gum up solenoid valves on both semi's and supers. It leaves behind a green residue when you use too much.