With my first, we washed each bottle by hand, then put them in a pot of boiling water, and air dried.
That get's old quick.
The dishwasher does JUST a good enough job at sanatizing, those things are piping hot when they first come out. I will rinse them out really good with hot water, put them in the dishwasher, then air dry.
Everytime a bottle get's used, it goes into the wash, so all bottles are clean and santized. I put all the nipples in a tupperware container, and cover it, that way dust, flies, whatever random things are in the air cant land on them.
Save yourself time, and money, use the dishwasher.