I have a Medela pump. My question is how in the world can I clean the itty, bitty spaces in the connector piece for the breast shield? I use the pump parts wipes while I am at work and wash the pieces in hot, soap water at home. But there are tiny areas that I can't get to, even with a Qtip. There is a white build up in there-im not sure if its soap or old milk or what. I have sent them through the tip rack of the dish washer but that doesn't help. Any ideas would be appreciated!