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The key phrase here is "have to". I completely agree with you in that case. If you have to add anything to your lather to make it work for you, then you have problems with your soap, water, brush,...

Interesting idea...

From time to time I'll add a few drops of vegetable glycerin to certain soaps before I whip em up and I like the effect. I might give this a try as well.

Jim, I disagree...