Mine go in the dishwasher too. I put the tube thing in the utensil rack, big end down. Bottles go on the tines of the upper rack... all the other pieces go on the nipple basket. I put the tan things in the bottom, just like the nipples go. So far no problems. But you can be sure that now I'll be looking in the nooks and crannies for yucky stuff. Those bottles are great, but they sure are a pain for cleaning and assembling. Nothing worse than putting the bottle together in a fog, only to realize the formula is pouring all over the baby b/c the bonehead mother didn't put all the pieces in!!!