Keep your pump parts clean??

I have a new PISA and I can't seem to keep the middle part (the part that the breast shield connects to on the top and the yellow thing connects to on the bottom) clean. I use the Medela wipes between pumps and use the sanitizing bag for the microwave once a week. I even put the parts in a bowl of just boiled water yesterday and they still aren't clean!!

And the yellow things, I can't seem to get the milk residue out of them either. I push the wipe all the way down into it and turn/twist it, but it just doesn't get it clean.

Any hints? I pump 3x a day at work and once in the morning (if I'm not too lazy to get out of bed, I work 3pm-11:30pm) and I really want the parts clean, but I just can't seem to get them as clean as I'd like! I had the same problem with the yellow parts when I pumped for Jailee, but since the middle part of the shield is changed from the PIS, I can't get that part clean now either.

TIA!

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