I have not washed my hair with shampoo for almost 5 months.(if you comb it with your hand you would say i washed today with shampoo)
http://api.ning.com/files/ltOvHbAbkWMuCyfKkJTy3FKTGsi1TxbTkTmhIxh4j7I_/wwwww.bmp
I just estimated upon that for the rest of the body.
Problem is, your hair does not have bacteria, or the same bacteria that your skin has, particularly the arm Pitts, crotch, and feet. When those guys start eating the dirt and skin oils then that is the problem. Well, the Bacteria farts are.
I have smelled homeless people, from afar, and your body won't adjust, it will just get stinkier. Of course, while you may stop noticing your own miasma, everyone else will think you reek.