How do I clean the Philips Respironics innoSpire Go mouthpiece?

The mouthpiece is only one part, it should be released from the handset for cleaning.

After each use

Pour away residual medication from the medication chamber. Press the mouthpiece assembly release button to separate the mouthpiece assembly from the handset. Rinse the mouthpiece assembly thoroughly under running tap water. Shake off excess water and allow to air dry fully before storing.

Daily cleaning

Wash the mouthpiece assembly by hand in a bowl of warm soapy water (liquid dishwashing soap) for 2 minutes. Rinse the mouthpiece assembly thoroughly under running tap water. Shake off excess water and allow to air dry fully before storing.

You should not put your mouthpiece assembly in the dishwasher. Do not use white vinegar.

Weekly disinfection

CAUTION: Risk of scalding. Use care around boiling water and in handling hot parts.

Prior to disinfection, ensure all parts are visibly clean and free from dirt/debris. Boil the mouthpiece assembly in water for 10 minutes. Ensure the medication chamber lid is open and there is enough water in the pan to prevent the mouthpiece assembly from touching the bottom or boiling dry. Shake off excess water and allow to air dry fully before storing.

Or 

Immerse the mouthpiece assembly in a disinfectant of the Gluteraldehyde group (testing performed with Korsolex Extra, 4% for 15 minutes). Rinse thoroughly according to manufacturers instructions.