Reviews.com reviews various body wash options, from store products, to common practices. They discuss this with some of the top dermatologists including Dr. Michele Green.
For example: if you have sensitive skin, Dr. Green recommends that you be boring, skip fragrances and dyes and stay away from Alpha Hydroxy Acids (AHAs). Dr. Green also recommends avoiding the use of a loofah, and talks about how to best take care of not only your skin, but taking care of a bar of soap also (spoiler alert, keep it somewhere where it can easily dry)!
Read the full list where they ask several dermatologists about their preferred methods and options at: http://www.reviews.com/body-wash/