How do I clean the infuser and how often should I do it?

The infuser (A20) must be cleaned at least once a month. Turn the machine off, remove the water tank, open the infuser door (A19), press the two colored release buttons and pull the infuser out, then soak it in water for about 5 minutes and rinse under the tap — use water only, no washing-up detergent or dishwasher. After cleaning, slide the infuser back onto the internal support and push it in until it clicks into place. (Page 16-17)