A detergent powder composition for dishwashing machines comprising 25-40% amorphous sodium silicate, l0-40% sodium carbonate, l5-40% phosphate builder, 0.25 to 5% of each of an amylolytic enzyme and a proteolytic enzyme and up to 60% of bulking agents and optionally up to 5% surfactant. The preferred builder is sodium tripolyphosphate and the preferred bulking agent is sodium sulphate (optionally together with sodium chloride) in an amount of at least 30%.