Well Don, Following your excellent advice, I calmed down a little. I now throw all the neb & Aerobika parts into hot soapy water for a 30 minute soak, then (hot) rinse and air dry. But I have skipped sterilizing for quite a while with no ill effects. I still change out the tubing and mouthpiece frequently, most usually because I lose the little "doohickey" the propels the mist, and each of my kits comes with one mouthpiece, one mask & new tubing.
My little guys love the (washed) old tubing to fuel their toy cars, and for all kinds of imaginative play. Any suggestions what to do with all the accumulated masks?
Sue