In order to keep your Halo free of any unwanted taste or odour, we strongly encourage regular cleaning. We recommend rinsing your Halo Bottle after each use as well as regular cleaning of your bottle and lid in hot soapy water.After using your Halo Bottle for liquids such as fizzy drinks, milk, fruit juices or alcohol a deeper clean is best and we recommend using water and bicarbonate of soda. For bad staining or odours we recommend adding some vinegar. Do not use stringent cleaners as this may damage the bottle.After cleaning and when not in use, we recommend storing your bottle with the lid off to allow the inside to dry and keep your Halo fresh!