Remove the wand by rotating and pulling it down. Detach the top and metal parts by pulling them apart. Remove knob by turning and pulling towards you. Clean with washing-up liquid and a soft sponge (dishwasher-safe). Rinse the knob.

 Dry all parts with a dry cloth. Make sure everything is completely dry. Place back the knob into the wand. Re-attach. Make sure the metal tube is fully attached. Attach the wand back onto the machine. Push upwards until you hear a click.