Jen, I soak my Aerobica in warm water with a drop of Dawn. I then agitate device and let sit for half hour, rinse in warm water, shake off excess water and let dry on paper towel. At end of day, I mix 3 parts warm water with 1 part white vinegar and let sit for hour. Close with final warm water rinse, shake off excess water and dry on paper towel. If not using daily, store in plastic bag.
I had tried substituting end of day cleansing with placing in boiling water, as instructions indicated, to save money. However, coupler became soft and became distorted and unusable.
Hope this was useful, Jan.