A tip known to most older Snobs, I thought worth mentioning for the benefit of newcomers to the site.
The portafilter wiggle helps in keeping the group head area clean.
When finishing a session with the machine still turned on lock the portafilter lightly into place then activate the pump, when the water starts to flow wiggle the PF from lightly locked to unlocked for a few seconds, helps keep the group head and shower screen clean and free of coffee grounds.
If your machine has a three way over pressure valve then carrying out the same wiggle with a blind filter will do an even better job.
The portafilter wiggle helps in keeping the group head area clean.
When finishing a session with the machine still turned on lock the portafilter lightly into place then activate the pump, when the water starts to flow wiggle the PF from lightly locked to unlocked for a few seconds, helps keep the group head and shower screen clean and free of coffee grounds.
If your machine has a three way over pressure valve then carrying out the same wiggle with a blind filter will do an even better job.

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