I had zero success with this. Nothing. Period. Honestly, the only thing that has FINALLY worked for me is laser hair removal. The hair is not gone, but it is definitely thinning out, and that shadowed look is gone. One thing you may want to consider is waxing your moustache instead of shaving. If you have a few days where you can avoid society (at least that's how I am!) in order to grow it out a bit, I've found the results are much better. My hair started growing in slower and lighter. Plus, if you wax, you only need to do it every six or so weeks and can just pluck in between. I don't know your growth patterns, so that may not work...just a suggestion.
