L.K.
Hey S. :)
I only sterilized the bottles and pumping bottles once, before using them. Then I would wash them with special detergent we bought (some kind of organic frangrance free thing) and using washing brushes only for the bottles (not for rest of the dishes) and then I would let them air dry. I never put in the dishwasher. We also use glass bottles. :)
On another note, I also only sterilized her pacifier once before first use, then if it falls I just rinse it with water. If it falls somewhere really dirty I wash with soap. :)