I don't have time to search thru previous posts...I have to supplement and i'm trying to pump enough to provide 1 extra ounce per feeding. Do I have to wash and dry pump parts that touch milk between each pump? I heard or read somewhere that I can put the parts in the fridge, but I'm not sure if I have to rinse. I'm worried about getting water in the tubing or my milk...I want to avoid formula as much as possible because my LO's skin gets really red any time formula touches her, face, cheeks, lips. No swelling so I think just contact sensitivity. Any info on storage between pumping, as often a she eats, would be greatly appreciated!