Unless I missed it .......Dr. Honda did not talk about disinfecting by boiling water to a high temperature. Do you recall if she did.?
For myself I wash the Neb cup and mouth piece in unscented detergent and then disinfect in high temperature boiling water for five minutes. The boiling water is cold tap water boiled for ten minutes before I place the items in the glass pot. Yes, glass pot...found it at a garage sale. Love it. Mom, many years ago had a glass coffee percolator. The good old days with well made products that last more than '10 seconds," so to speak.
I also soak it in the vinegar and water combination due to hoping it will clear any salt or calcium build up in the cup etc. I dry all on paper towels above and below the pieces. That's my method with fingers crossed with that method and staying out of 'harms way' in other aspects that we try to be careful with.
Barbara