For what it’s worth, scrubbing to get that “squeaky clean” feeling removes the protective layer of sebum between your skin cells. It dries out your skin, and hence, causes your body to go into overdrive producing more oils. As a result, you end up really greasy by the end of the day. After learning this, I backed off the temperature of my daily shower, switched to a pure Castile soap, less of it, and stopped scrubbing vigorously. Now I don’t leave oily smudges on my phone screen, except after sweating a lot. Also, no more itchy, dry skin and cracking knuckles in the winter.

Phones and keyboard are filthy, but it's more about people usually not cleaning them enough and not about people not being clean enough.

The amount of bacteria on thoroughly and often soap-washed skin very quickly rises high because of the missing acid and/or oil layer.

The “only use soap on armpits+groin+feet most of the time” recommendation is not made up.