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Originally Posted by darkmoon  Because we were taught to use soap by our parents.
If I remember correctly from physics class, the essential working of soap is that it decreases the surface tension of water. This way it's a lot easier for the dirt on your skin to dissolve in the water. So the use of soap is probably not essential, but you'd have to rub a whole lot harder to remove the same amount of dirt without it.
To see the surface tension of water, fill a glass and slowly keep filling it when it's full. You will see the water bulges a bit above the border of the glass. With soapy water you can't do that.
I wouldn't know, I always used soap  But I tend to use soap that has a weak smell... |
Awesome! I love the answers, I'm happy to post this on my blog. Can I get your first and last name (you can make these up for security reasons)?