What I would like to know is if there is a trick to cleaning the rubber squeezy part of the dripper. I've boiled and ultra sonically cleaned some and I figure that if you can still smell some to the old juice, I might not be chean. Do I have to just live with it or can I soak them in some solution that will neither harm or dissolve the cap? I need that book from the woman with the weird name on "How to clean anything".