JA102019 Diversey Suma L4 Machine Dishwashing Detergent 5 Ltrs. Suma L4 is a highly alkaline liquid detergent for use in industrial automatic warewashing and glass washing machines. Suma L4 is suitable for use in medium to hard water conditions and is designed to remove fatty and proteinaceious soiling and is particularly effective against tea and coffee staining. Suma Special L4 is a concentrated liquid mechanical ware washing detergent specially formulated to provide excellent soil removal in medium hard water conditions.