Miele Standard Operating Instructions Manual page 15

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Do not fill the rinse aid reservoir with powder or liquid detergent.
This will cause serious damage to the reservoir.
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Inadvertently filling the salt reservoir with powder or liquid
dishwasher detergent will damage the water softener.
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Miele recommends using specially designed dishwasher salt to
maximize the performance of your dishwasher and to prevent a
build-up of calcium and limescale in the dishwasher cabinet,
especially if you live in a hard water area. Dishwasher salt can be
purchased online at www.miele-shop.com (depending on country)
or directly from Miele.
Do not use other salts such as cooking salt, agricultural grade or
gritting salt. These may contain insoluble additives which can impair
the functioning of the water softener.
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In an appliance with a cutlery basket (depending on model)
cutlery is cleaned and dried more efficiently if placed in the basket
with the handles downwards. However, to avoid the risk of injury,
place knives, forks and other utensils with sharp points with the
handles upwards.
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Plastic items which cannot withstand being washed in hot water,
such as disposable plastic containers, or plastic cutlery and
crockery, should not be cleaned in the dishwasher. The high
temperatures in the dishwasher may cause them to melt or lose
shape.
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On models with "Delay start", make sure that the dispenser is dry
before adding detergent. Wipe dry if necessary. Detergent will clog
if poured into a damp dispenser and may not be thoroughly
dispensed.
Warning and Safety instructions
15