What should I do before using the Wdal 8640 for the first time?

Before first use, run a wash cycle with detergent and no laundry using the 'Auto Clean' programme. This cleans the internal parts of the washer-dryer before you begin washing clothes. Simply press buttons A and B simultaneously for 5 seconds to start the programme, which lasts approximately 70 minutes. (Page 4, Page 6)

From the official Hotpoint Wdal 8640 manual, page 4

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