The document describes a biological solution called AMBRA clean for decontaminating oil-polluted soil. AMBRA clean is injected into the soil where it emulsifies hydrocarbon chains and dissolves the oil into tiny water droplets. This serves to break down the oil using bacteria already present in the soil. The solution provides nutrients that allow bacteria to multiply and degrade the hydrocarbons completely within a few days, leaving no toxic byproducts. AMBRA clean has been successfully used since 1998 to decontaminate oil-polluted soil and groundwater.