I love and enjoy using Purdoux CPAP Mask and Hose Green Tea and Mint Soap on my cpap hoses and water tank. It leaves a mild scent and bubbles frothy making me feel that the soap is really getting my equipment thoroughly cleaned. I've tried other soaps before, but I keep coming back to Purdoux Green Tea and Mint, so much so, that I bought a box of ten bottles last time. I love it so much and know it'll last me close to a years worth. Thanks so much!