How do I prepare the Bosch washer dryer before using it for the first time?
Before first use, run the Drum Clean programme at 90°C without any laundry to remove residual test water from the factory inspection. Add approximately 1 litre of water into dispenser II and standard detergent according to manufacturer's instructions for light soiling, using only half the recommended amount to prevent over-sudsing. Do not use woollens or mild detergents for this initial cycle. (Page 20)
From the official Bosch WDU28 Washer Dryer manual, page 20
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