The water alone will not do much for cleaning but it will rinse it between daily use.
To actually clean the machine, I use a cleaning product such as
Joe Glo - Espresso Machine Backflush Detergent.
http://www.seattlecoffeegear.com/Joe-Glo-Espresso-Machine-Backflush-Detergent-p/scg10023-4.htm
The tricky part is the actual cleaning, first your going to want to clean the tank, and dump that out. Then re-fill the tank with cleaning product and run it through the machine. After cleaning run water through at least twice. If you don't do this you will just force the gunk from the tank into the head, clogging it worse.
Additionally they make a brush for scrubbing the head, if needed.
Sometimes when I don't have the detergent I just use white vinegar.
Enjoy your espresso machine.
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