The little guy - Group Head Shower
Group head Shower (does not include screw)
The Group Head Shower is in the group head, and their job is to shower the brewing water evenly to the coffee puck.
The Group Head Shower gets dirty over a period of time as they are in contact with the coffee puck.
To wash the Group Head Shower, unscrew the screw that holding the shower screen. You will need a 2.5 mm Allen key to remove it.
You will end up with three parts; Group Head Shower, Group Head Seal and the screw.
Soak Group Head Shower and the screw in hot water and espresso machine cleaning powder for 10-15 minutes and then brush them after soaking with a Group Head Brush. You can find a brush here.