Miele WXF 660 WCS TDos Operating And Installation Instructions page 59

Removing and cleaning the insert for
liquid detergents
An insert for liquid detergents is located
in the  compartment of the detergent
dispenser drawer.
 Remove the insert. Clean the insert
thoroughly with warm water.
Cleaning and care
Cleaning the  compartment
Compartment 1 has a siphon for better
dispensing of the chlorine bleach.
 Remove the release catch.
 Remove and clean the siphon.
 Clean the  and 
compartments with warm water.
59