I recently moved into a new home and the dishwasher does not drain. I look a the screen on the inside as per my home warranty repair book suggested but to no avail. I had a repairman come out and he suggested that the drain plug has not been removed. This information was given to my wife. I saw a hose leading from the dishwasher to the garbage disposal and remove it. I stuck my finger on the inside of the connection point at the garbage disposal and felt what appears to be a plug. Please assist for I the previous owner did not leave any manuals.