This is something I have always wondered/pondered/fretted about. I cant use a bar of soap if someone else has used it. Why? Because it's not clean. But Leisa, you say, soap is soap, its disinfecting properties make it clean. Its soap for God's sake! But think about this, germs culminate in moist, warm places, and where do you use soap, in a hot shower(ie: warm and moist) So by this rationale, soap could never be germ free, thus its not clean. And also, by this rationale, I shouldn't use a bar of soap more than once, even if it is only I that used it to begin with. I should probably invest in some soap in a bottle.