To remove the dispenser do the following:
Remove the outer door,remove the fascia panel and disconnect the wire harness from the fascia panel.
Disconnect the wire harness from above the dispenser, then remove the wires to the wax motor and reed switch.
Disconnect the condensation tube if it has one. Mostly found on older models.
Bend the retainer tabs,then push the dispenser inward. Protect your hand with a towel as the edges are sharp.
When installing new dispenser lubricate the o-ring with rinse-aid. | 
Bosch 
