Once you've weaned to sippy cups, you might be thanking your lucky stars that you don't have to deal with all the loose bottle or breast pump parts any longer. That is, until you find out that the average sippy cup has just as many parts. What's worse -- all those little cup pieces are harder to keep clean and they can harbor all sorts of bacteria and mold. So, here are some tips from me and the seasoned and ever-so-wise forum parents on how to keep the crust out of those cups.