Going back to work soon. If I pump two or three times at work, how will I clean the breast sheild parts between sessions at work so I can use them again? Is it necessary? I usually use parts once then wash and sterilize at home. I'm not sure I'll have time to be that thorough at work after each session. I have wipes to clean parts after using, but is that safe to use between sessions too? Should I just buy more parts?