Miele CVA 7445 Operating And Installation Instructions page 14

IMPORTANT SAFETY INSTRUCTIONS
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Descale the coffee system 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 that 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.
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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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Rinsing coffee grounds down the drain can cause the sink to clog.
Instead, dispose of your coffee grounds appropriately as
biodegradable waste (where facilities exist) or by composting.
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