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Glycerin is a pretty good water-soluble lubricant. As well as being the lead ingredient in "personal lubricants" (including KY Jelly), it's used as a lubricant to encourage hoses to stretch over...

FWIW:

I have a theory:

. . . If you use very light pressure, the razor glides over a thin layer of lather, and shaves off hair.

. . . If you use heavier pressure, the razor breaks through...