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.本發明提供一種:洗淨後的廢液不會對環境造成不良影響,可利用濃度較低的還元水、酸性水並以較短的時間,去除附著於容器的汙物或細菌、或者附著於蔬菜或水果等農作物的農藥或細菌的洗淨裝置及洗淨方法。本發明的洗淨方法具備:利用還元水洗淨容器或農作物的洗淨步驟;和利用酸性水,對前述洗淨步驟後的前述容器或前述農作物執行消毒的消毒步驟;和利用清洗液,對前述消毒步驟後的前述容器或前述農作物執行清洗的清洗步驟;和回收「用於洗淨的還元水廢液」及「用於消毒的酸性水廢液」,並利用光觸媒材料對前述還元水及前述酸性水進行淨化處理的淨化處理步驟;及利用過濾器,對前述淨化處理步驟後的前述還元水及前述酸性水進行過濾的過濾步驟。可藉由將經過濾器過濾的液體,供給給還元水、酸性水用,而提供循環型的洗淨裝置及洗淨方法。1‧‧‧消毒部10‧‧‧洗淨裝置11‧‧‧第2噴嘴12‧‧‧消毒液貯留槽(消毒液供給源)2‧‧‧清洗部21‧‧‧第3噴嘴22‧‧‧清洗液貯留槽(清洗液供給源)3‧‧‧乾燥部31‧‧‧第4噴嘴32‧‧‧氣流產生手段4‧‧‧設置面50‧‧‧第1限制具501‧‧‧棒材502‧‧‧上片材51‧‧‧第2限制具511‧‧‧棒材512‧‧‧上片材52‧‧‧第3限制具53‧‧‧第4限制具6‧‧‧洗淨部61‧‧‧第1噴嘴62‧‧‧洗淨液貯留槽(洗淨液供給源)7‧‧‧淨化處理部8‧‧‧過濾部9‧‧‧電解水製造裝置B‧‧‧瓶子
