Miele CVA 7440 Operating And Installation Instructions page 14

Warnings and safety instructions
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Descale the coffee machine regularly depending on the water
hardness. Descale the appliance more frequently if you use hard
water. Miele cannot be held liable for damage resulting from not
descaling the machine, using the wrong descaling agent, or an
unsuitable descaling solution concentration.
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Degrease the brew unit regularly with the cleaning tablets.
Depending on the natural oil content of the coffee used, the brew
unit can become blocked quite quickly.
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Do not use a steam cleaner to clean the appliance. The steam
could reach live electrical components and cause a short circuit.
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The espresso / coffee grounds must be disposed of in the organic
waste or compost, not in the sink. The drain can clog up as a result.
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