"The idea is that, much like any blade, your razor dulls primarily because of small imperfections in the surface of the blade. For old-timey razors, people would run the blade against leather to smooth out these imperfections. With your kitchen knife, that "sharpening" steel doesn't actually sharpen your knife, but, like the leather, it's there to smooth the imperfections."
I had an old dispoable razor that was not as sharp as it used to be, so I just ran it on my arm (backwards of course) exactly 30 times (yes, I actually counted). Then when I gave it a try, I actually noticed a pretty big difference! Shaving with the same disposable razor almost felt like new! This is a great tip that I will be using for a long time.
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