Why YSK this is that some of the soap absorbs into the fruit, especially berries, and let’s say you are washing your cherries with dish soap, and you eat them. That story ends with a long bathroom trip as soap makes you a little queasy. ETA: Nobody has heard about this?! I see it in the southeast where I live.
Well this is a first. I have never heard anyone do this! Usually I’ll just do something like rinse off things like apples/oranges. If it’s something that is more easily bruised like berries, I’ll throw them in some water with some salt in there.