Is this mold in tubing?

I know it’s hard to see so I found a photo on google that looks the most similar to mine

I’ve seen some people say its Water spots but I’ve literally never washed this before. I’ve only had it a month so this is my first time cleaning it. When I seen it I thought it was dried milk but it’s not coming out with warm water & soap. The picture is after I tried cleaning it.
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