Not to hijack your thread, but I didn't think I should make another Duac thread. My doctor prescribed this for me, and I'm using it with Differin. Anyway, how are you supposed to use Duac? I'm supposed to be using it in the morning, but I have to leave for school by 6:30. Do I put it on, leave it on, then wash it off? Or just leave it on the whole time?