Hi; We are using Duac & SFC lotion for our Son who is 13. I have two questions; first, we would like to know where we can purchase just the SFC lotion; he seems to be using the lotion more, he always ran out of lotion before the Duac. Next; do we need to wash the face when you apply the lotion on a dry skin? Do we wash the face immediately or wait a while or not wash at all. Instruction on the bottle is not clear. I really appriciate any feed back I can get. Thanks a bunch.