The Beginnerโs Guide to Coffee Machine Maintenance
A good explanation from James Hoffmann.
Espresso Machines
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Basket
Just keep it clean. Clean it after each use. There are no reasons not to do it.
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Portafilter
Clean it at least weekly (I clean it every after each use).
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Shower screen
Clean it at least weekly.
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Flush after each brew
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Use a blank basket and a detergent for backflushing.
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Wipe a steam wand after each use and purge it.
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Descale regularly
Depending on water hardness and usage frequency, once or twice per year is typical. Alternatively, use "frequent descaling" with a lower concentration of descaler. Use a test to determine when to descale.
Coffee Grinders
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Just keep it looking nice. Youโll probably know when the burrs need replacement.
Batch Brewers
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Use espresso machine detergent.