When used for cleaning, soap solubilizes particles and grime, which can then be separated from the article being cleaned. Where soaps act as surfactants, emulsifying oils to enable them to be carried away by water. Soap is created by mixing fats and oils with a base, as opposed to detergent which is created by combining chemical compounds in a mixer. Humans have used soap for cleaning for millennia. Evidence exists of the production of soap-like materials in around 2800 BC in ancient Babylon.