I used the same ClO2 (MMS) for sterilizing any water based things, so insides of blenders, bottle caps and nipples, hot water thermos cups which hold water for long periods of time. After time you can smell they are not fresh and normal cleaning is not enough.
Probably the best use of ClO2 is in the summer, I use it as after bite for mosquito bites. Completely eliminates the itch in 5-10 minutes after dabbing it on the bite with a Qtip for several minutes.