Anybody use a hot towel as a prep, how long do you leave it on your face if you do so? I'd like to soften up my whiskers instead of them feeling like 100 grit sandpaper. I currently use AOS PreShave Oil. I have read somewhere that I should leave it on my whiskers for 5 min prior to applying lather? Maybe that will do the trick. I currently apply the oil, apply the lather in less than a minute afterwards.