What should I do before running my first load of laundry in the WAT28400UC?

Run a Drum Clean cycle with no laundry before washing your first load. Add 1 to 2 tablespoons of detergent to the main-wash chamber II, then run the Drum Clean cycle and wait for it to finish. This is necessary because every Bosch washer is tested before leaving the factory, which may leave a small amount of residual water in the drum and drainage system. (Page 20)