Soooooo, I used the 25% on my forehead and my crow's feet area. (After a patch test.) So when your skin frosts- and turns white, that means it's time to wash your face, correct?? That's what I got from the instructions. I didn't let my forehead "sit" with frosting on it- I didn't want to damage my skin. OR, should you let it stay on for a minute or so after you see frosting? Just asking the "pros" here before I do the rest of my face in a couple of weeks.