How Often to Clean a Group Head: What Makers Say

You can't tell if you clean the group head too rarely, or too often. The honest answer is that makers disagree, and the numbers depend on how much you use the machine. Here's what some of them say, and how to find yours.

Start with your own manual

Look in the cleaning section for a schedule. It might be a number of weeks, a number of shots, or a light on the machine. One guide says to follow the manual if it gives a specific interval¹. If the manual gives one, that settles it.

What published guidance looks like

These examples show the range. Some come from a maker's own manual, and some from a retailer's help pages for particular machines. None is a rule for your machine.

How use changes the number

The first manual in that table ties the schedule to use. It says that if you make one or two beverages a day, backflushing once every one or two weeks is probably enough². For a machine used all day, such as in an office or small restaurant, it says to backflush every day².

Don't copy those numbers onto your own machine. They belong to one maker's machine, and the manual calls its own light-use figure only "probably sufficient".

Light, regular and deeper jobs

Most routines come in layers.

• After use. Rinse the basket and portafilter under hot water³, and clean the screen and gasket area².
• Regularly. Run hot water through with the basket in and no coffee. One manual says to do this periodically to rinse out residual coffee³.
• Now and then. A deeper clean with a cleaner your maker names, by the method your maker gives. That might be a backflush, a built-in cycle, or taking the screen off, depending on the machine.

Signs it's due sooner

Sometimes the machine tells you before the calendar does. One guide gives two signs: dark oily buildup on the group head or screen, and slower or uneven shots⁷. The page on buildup lists what to look for.

If the buildup returns quickly even after you follow the manual, the maker's support team is the next step.

Machines that can't be backflushed

If your manual says not to backflush, the deeper clean has to be done another way. The no-backflush page covers how to check, and what the options are.

Whatever the number, write it down. Put the date on a sticky note inside a cupboard door, or in your phone, so you aren't guessing next time.