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I actually had to open the unit and clean the grounds from the tube and filter inside the unit. If you want to try something a little less invasive first, check out page 19 of the following document:
http://www.krupsusa.com/NR/rdonlyres/C308FB44-1EC6-4119-A060-C73BD65F4789/19896/XP2070espresso.pdf
It has instructions on cleaning the brew head, filter, filter holder, and the grid above it.