Simple, Remove The soap tray/Dispenser Drawer, and give it a good old clean with bleach. Then get a bowl, and a tooth brush and one by one, clean all the little holes at the top of the dispenser cavity. (Tiny dirt particles dissolved in the water gather here) Get a towel and run a rinse cycle, (the towel is necessary as a some water will run down the front) and continue brushing the holes. When you are satisfied that the water is running freely through all the holes, end the rinse cycle, and replace the dispenser drawer. Now you are god to go! (this is reguar mainteance)
Robert Clancy, February 2005