I add a little water to dissolve and then let the mixture dry on my face like a mask. After the mixture has dried enough I rinse it off with tepid water. I found that using Dove beauty bar is the best thing for sensitive and acne prone skin, and its not outrageously priced. It was recommended to me by a dermatologist and I have been using it for years. Use a mild facial soap to wash your face.
Ivory works quite well.
I use Black Ointment, which can be found at a local health food store, to get rid of occasional acne. It works great to get rid of redness overnight.