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Mike ,selection of soap depends upon your skin type.There are three basic types of skin : oily ,dry or a combination skin type.
In the market you would get soaps accordingly .You can even get face wash according to your skin type.
Personally speaking I would not recommend any body dettol
soap for face.It would be more harsh for face .For hands and body it is fine.
If you are not sure about your skin type then consult a dermatologist
who can help you .