[pastrami_panda]

I do this against a towel after each shave, I saw a video some 10-15 years ago of a guy doing it against jeans. I believe he also verified with a microscope it indeed made the blade sharper.

[BuzzVII]

I saw something similar. I thought it was Hank Green in a vlogbrothers video. My Google-fu isn't good enough to find it again.