How do I run the Auto Clean programme to clean the inside of the Wdal 8640?

Press buttons A and B simultaneously for 5 seconds to start the Auto Clean programme, which must be run with no load in the drum. The programme starts automatically and lasts approximately 70 minutes; it can be stopped by pressing the START/PAUSE button. Hotpoint recommends running a cleaning programme every 40 wash cycles for maximum performance. (Page 6)

From the official Hotpoint Wdal 8640 manual, page 6

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