A couple of weeks ago my water heater had some trouble (turned out to be a bad switch). So we went a couple of days without hot water. I had to use a hot water pot to heat for bath and shaving. The water got to boiling and I didn't let it cool too much before washing and shaving with it. I couldn't believe how much smoother my shave was! The lather was better, no razor burn, and just a great shave altogether.
Now I have gotten lazy with my preshave and simply used soap, hot tap water (which is not over hot...not sure of actual temp), and then on the the shave (brush and puck). I haven't even used my cup lately preferring to face-build.
But now I think I will go back to a super-hot water pre-shave!:tu