"Here is a very useful article titled ""Espresso Machines Cleaning Why, How, and When."" This article has several authors: Dave Stephens introduces why cleaning must be a regular part of your barista duties and how to perform them with step-by-step instructions focused on the business-end of your espresso machine. Nick Griffith outlines when these cleaning duties need to be peformed. Finally, Chris Tacy explains the salient differences between the cleaning regimes for home and commercial establishments. The instructions and recommendations presented generally apply to any espresso machine with a three-way valve type group; feel free to adapt these instructions to your own personal use. In doing so, you remove one impediment standing between you and great espresso."