This has come up a few times, It does work and does help the draw...

I have personally tried it with only two soaps Williams and MWF and both have worked fine..

Apply lather, let dry, use heel of hand to rub in "Repeat" that's it

I usually tell the story of a Illinois #827 that I decided to "Re-condition" and change from a pasted strop back to a plain strop I wanted to see if I could do it...
This strop always had a bad section, it set off the entire stropping action...
I sanded it, I rubbed it, I cleaned it, I conditioned it with near everything you could think of but that bad spot kept haunting me... I was basically done with it, when somebody asked about the Lather routine, "Ding" lightbulb went off that I had not tried this...amazing because I had used it in the past but somehow I never thought of it for re-conditioning...
Two applications of Williams and the draw was fantastic again...
Something to try out but experiment with caution