Bosch WAT28400TC Use And Care Manual page 34

Snap the service cover in place at the hinges and
8.
close it.Wipe up any spilled water.
NOTICE: In order to prevent detergent from flowing
unused into the drain during the next wash cycles: pour
0.26 U.S. gallons/1 liter water into the chamber II.
Turn the cycle selector to the Drain and touch the
Start/Pause button.
34