Miele KM 400 Operating Instructions Manual page 5

Do not drop anything on the
ceramic surface of the cooktop.
Although the ceramic glass is shock
and scratch resistant, it is not shock or
scratch proof.
Do not use pots or pans with bases
with pronounced edges or ridges
on the ceramic cooktop. These could
permanently scratch or scour the
cooktop. See "Selecting cookware" for
more information. Grains of salt and
sand can also scratch the surface.
Make sure that the bases of any pots
and pans are clean, free of any fat or
oils and are dry.
Do not allow either solid or liquid
sugar, pieces of plastic or
aluminium foil to get on the cooking
zones when they are hot. If these
residues are allowed to cool on the
ceramic surface, pitting or cracking
could occur. Should sugar, plastic or
aluminium fall on to the cooktop, first
turn the appliance off, then immediately
scrape off the remains with a shielded
blade scraper while the surface is still
hot. Take care not to burn yourself on
the hot surface. Clean the cooktop
once it has cooled.
Do not use a steam cleaner to
clean the appliance. Steam could
penetrate electrical components and
cause a short circuit.
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