Provided are a washing method and washing device making it possible to remove dirt and bacteria adhering to a container and pesticides and bacteria adhering to a crop product such as a vegetable or fruit, in a shorter period of time, by using lower concentrations of acidic water/alkaline water, and without adverse environmental impact from waste solution after washing. The washing method comprises: a washing step for washing a container (B) or crop product (A) with alkaline water after the washing step, a sterilization step for sterilizing the container (B) or the crop product (A) with acidic water after the sterilization step, a rinsing step for rinsing the container (B) or the crop product (A) with a rinse solution a purification treatment step for recovering the waste solution of the alkaline water used for washing and the waste solution of the acidic water used for sterilization, and running the alkaline water and acidic water through a purification treatment with a photocatalytic material and, after the purification treatment step, a filtration step for filtering the alkaline water and acidic water with a filter. Providing the solution having been filtered with the filter for use with alkaline water/acidic water also makes it possible to provide a circulation-type washing device (10) and washing method.Linvention concerne un procédé de lavage et un dispositif de lavage qui permettent déliminer les saletés et les bactéries adhérant à un contenant ainsi que les pesticides et les bactéries adhérant à un produit récolté tel quun légume ou un fruit, en moins de temps, à laide de concentrations deau acide/eau alcaline plus faibles, et sans impact environnemental négatif émanant de la solution résiduelle après lavage. Le procédé de lavage comprend : une étape de lavage destinée à laver un contenant (B) ou un produit récolté (A) avec de leau alcaline après létape de lavage, une étape de stérilisation destinée à stériliser le contenant (B) ou le produit récolté (A) ave
