I have not heard this before, but when I read Gonneke's first post I 
thought, "That makes sense."  I have definitely noticed when 
hand-washing dishes that things with milk and raw egg on them get a 
film right away if I rinse with hot water, whereas if I rinse first 
with cold water, they wash up easily.

Kathy, I wonder if the fact that you are putting pump parts directly 
into hot SOAPY water is the difference here?  I think both of you may 
be 'right'!

Margaret
Longmont, CO

>Kathy, You make me realise that I never questioned this and have 
>always taken it as one of those things ''everyone knows''. No, I 
>never tested and never read any research on it, just presumed it to 
>be true. I think it may even stem from my childhood where I learned 
>from my mother or even grandmother to always do the milky things 
>with cold first and hot afterwards.
>
>Warmly,
>
>Gonneke, IBCLC, LLLL, learning in southern Netherlands
>
>Kathy Eng <[log in to unmask]> wrote:
>  >
>  > May I respectfully ask where the idea that the milk protein would
>>  stick to the pump parts if not rinsed out with cold water comes from?
>>  I have washed literally hundreds of pump parts for mothers and have
>  never noticed anything that looks like a coating afterwards.

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