Miele PG 8581 Operating Instructions Manual page 52

Adding and dispensing process chemicals
52
Add powder cleaning detergent to the dispensing reservoir.
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Close the flap.
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 Make sure that all of the cleaning detergent has dissolved at the
end of the program.
Repeat the program if residual detergent is present.
Check whether any wash items have prevented the flushing out of
the dispensing reservoir and rearrange the wash items if necessary.