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I'm not a soap technologist :) - but it has seemed to help for me, and also I think those "uberlather" guys are using a couple drops of glycerin straight. Would second also the note by JeffR.

Do...

Here's my experience with my city tap water that ranges from 150-400ppm hardness:
1) My new out of the box Tweezerman brush did not perform as well until it lost the "animal" smell. Learning curve?...