I use soap (well, shower gel) on my private parts and armpits, but places like my elbow, knees, back or feet (fortunately my feet don't sweat nor smell) regular

I use soap (well, shower gel) on my private parts and armpits, but places like my elbow, knees, back or feet (fortunately my feet don't sweat nor smell) regularly go for weeks or months without soap. I can't imagine using only water for prolonged periods of time, but you can go VERY light on soap and still be a clean looking (smelling) human being.