K.M.
If you have a dish washer they sell racks to hold all of the small parts for the bottle (nipple, rings, etc.). I put the baby's bottle and accessories in the dish washer every night and I never had a problem. Munchkin makes a wonderful rack that holds the nipples (up to 14 of them) in slots in the lid to hold them upright for a better cleaning. I used this one and let me tell you, I was able to wash all parts of the Dr. bottles in there for 8 bottles and everything came out clean. I actually used to put the vent system thru the upside-down nipple rings to make more space. The rubber part of the vent system used to pop into the slots in the lid with the nipples.