To ensure the longevity and cleanliness of your AquaTru Stainless Steel water bottle, handwashing is the most effective method. This approach not only helps maintain the integrity of the bottle but also ensures that it remains free from harmful bacteria and contaminants. We suggest using warm, soapy water to thoroughly clean your bottle. The warmth of the water aids in dissolving any residues, while the soap works to eliminate any dirt or grime that may have accumulated during use. By taking the time to handwash your water bottle regularly, you can enjoy a fresh and hygienic drinking experience every time.