I was told that you can just use the dishwasher as the dishwasher goes up in the high temps to wash dishes etc...maybe its just the ones here in aussie that go up to the hot degrees...(like boiling your bottles..they do the same thing!)...but my MW said that I can just bung the bottles in the dishwasher as it sterilises the bottles and teats etc...because it goes up in the high degrees needed! (hope that made sense!) I know that over here we use higher voltage for power etc...so maybe our electrical appliances do???? I dont know...but I never had any probs anyway with dishwashing my bottles for my first.