How does soap work?
In most cases, it simply binds dirt and washes away bacteria, leaving your hands clean.

Does soap kill bacteria?
Only some types that contain antibiotics. And they only act on certain groups of bacteria. Quite a rare thing.

Can soap be dirty?
No, most bacteria cannot live on its surface.

Should you always wash your hands?
First of all, before food or its preparation, when there is a risk of bacteria entering the mouth and stomach.