I have seen all you guys posting and not one of you spoke of the best way by far to do it ,the only sure way and that is autoclaving go look it up and you would be amaze it is easier no worries nothing .It is the way all the international companies sterilize their equipment .Takes all the worries out of it ,you know what it would be like to wash out 100's of vials and stoppers .
It wasn't brought up because it's not pratical to the average home brewer.