Hi, thanks for using JustAnswer.com. There is likely an issue with the dispenser assembly and the routing of the water, or perhaps with the water inlet valve. Please post your model number so I know exactly which Duet we are working with.
It's a duet HT Model GHW9400PL$ Serial number CST1911597
This dispenser is operated by a motor (number 13) that moves to direct the water to the corresponding compartment. Are you sure that it is bleach that is left in there or could it be just water? That is important...
Remove the top, 3 screws along the back come out to allow the top to pull back and off. Once off, let me know.
I emailed last night about 8:30 pm this information so not sure you received it.
Whirlpool Duet HT model GHW9400PL4 and serial number CST1911597
Okay, now remove the hoses from the rear of the dispenser and be sure they are clear of all mineral deposits and clean as well. If there is a flow restricter in them, be sure to leave them in and in place.