Miele Built-in coffee machine Operating And Installation Instructions page 17

Cleaning and care
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The coffee machine must be disconnected from the electricity
supply before cleaning or maintenance.
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Clean the coffee machine and the milk flask thoroughly before
using for the first time (see "Cleaning and care").
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Clean the coffee machine and the milk flask every day (see
"Cleaning and care").
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Do not use a steam cleaner to clean this machine. Steam could
reach electrical components and cause a short circuit.
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Descale the coffee machine regularly depending on the water
hardness level in your area. Descale the machine more frequently in
areas with very hard water. Miele cannot be held liable for damage
arising from insufficient descaling, the use of incorrect descaling
agent or the use of descaling agent which is not of the appropriate
concentration.
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Degrease the brew unit regularly with Miele cleaning tablets.
Depending on the natural oil content of the coffee used, the brew
unit can become blocked quite quickly.
For machines with stainless steel surfaces:
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Do not use sticky notes, transparent adhesive tape, masking tape
or other types of adhesive on stainless steel surfaces. These
damage the surface, causing it to lose its dirt repellent protective
coating.
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The finish on stainless steel surfaces is susceptible to scratching.
Even magnets can cause scratching.
Warning and Safety instructions
17