No need rinse off residue or use water wash. just leave it as it is and dump inside ziplock bag put in fridge. it’s just breastmilk residue which is not dirt. The more you introduce other elements like water or other contaminants the less effective this hack will work.
no rinse..I hVe used the hack before but mine is secondhand pump so the parts tend to drop off during pumping for 2nd time. especially the yellow parts like the backflow preventer
Thank you mummy
Anonymous