S.T.
I second the recommendation for Cetaphil. My dermatologist said it's what he recommends for sensitive skin. I've since switched to the Mary Kay Timewise cleanser, because I wanted to try something different (and I really like it), but I used Cetaphil for years. It's very good and very affordable.
I also used to use a soap called "Basis" back when I was a teenager, and it's also very gentle and very good. Hope this helps.