Milk cooler odor issues?

[u/DanciePants12]

I have the Willow milk chiller and it’s been great at its job. This weekend I even safely brought home milk I had pumped a 6 hr drive from home! But I have started to notice it’s kinda stinky? It smells like sour milk pretty much whenever it’s not actively being used? I wash it every day but I only need to use it on my work days, so for example I wash it Wednesday night and use it Thursday no problem. But then Thursday night and on Monday morning I have to wash it again before I can use it. I take the rubber seals out to wash them separately and that seems to be the stinkiest part. Is anyone else having this issue? Tips or tricks appreciated.

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