I had treated these blades a while ago, actually prior to trying mineral oil. It was Robert Williams suggestion to me as well, when we spoke about the razor he was making for me. At the time i had fewer razors and they were in rotation more frequently, which made the oil application a bit of a pain. I have recently switched to one razor for a few days back-to-back and like others, they are stored outside the bathroom in air-conditioned (low humidity). The razor in rotation gets dried and put away naked, while all the others get a swipe of mineral oil.

I imagine the hot water is softening any wax on the blade because the foggy residue appears to be the same as what dried wax is like during the initial application.