Hydrorace Drinks Bottle Cleaning Agent is vital to stop harmful bacteria from building up in your Hydrorace drinks bottle. Sports energy and hydration supplements left in your bottle, drinking straw and bite valve can lead to an upset stomach, which is the last thing you need during a race day!! While your drinks bottle needs to be washed out every day, you need to do a deep clean every couple of months so soak your bottle and parts in a solution of water and Hydrorace Drinks Bottle Cleaning Agent. Comes in a pack of 20, these Sigg bottle cleansers will kill off any bacteria hiding in the not so visible areas of your drinks bottle.