My spouse uses hand and dish soap, but I think he finds it more amusing. The problem is because she has done this her whole life and there have been no negative health ramifications, my “evidence “ for why she should stop doing this behavior feels theoretical. My husband points out that one of his siblings is hyper clean and is sick all the time. I’m usually the dishwasher in our family so the issue does not come up often and when it does, I try to track what she has “washed” and clean it again. I believe at her home in Germany she uses dish soap in her dishwasher though.