I've done a fair amount of research on bottle cleaning and sanitizing and I find most people use the dishwasher. I have concerns with that. Even though it says sterilize, and it will sterilize most things, I strongly doubt it sterilizes bottles. The water will not get up into the bottles. I also read about an experiment where someone was able grow cultures from "sterilized" bottles in the dishwasher. However, most people do use it without issue. I use the oven. I find it to be very easy. I clean the bottles first than with aluminum foil and put them in the oven very slowly take it up to 300 deg. and then slowly drop the temp back down. Fast temp changes will break the bottles.