Patent ID: 7531490

Claim:
A detergent composition consisting essentially of: (a) 2 to 30% by weight of an inorganic alkali selected from the group consisting of sodium hydroxide and potassium hydroxide; (b) 0.5 to 15% by weight of at least one surfactant selected from the group consisting of an anionic surfactant and a nonionic surfactant; (c) 0.01 to 2% by weight (based on calcium ion) of calcium gluconate; (d) 0.1 to 15% by weight of a calcium ion-sequestering agent; (e) 1 to 30% by weight of a water-soluble organic solvent; and (f) 20 to 95% by weight of water, wherein the calcium ion-sequestering agent as the component (d) is a combination of (d 1 ) an oxycarboxylic acid and/or a calcium ion-sequestering agent having a chelate stability constant log K ca of 1 to 4 with (d 2 ) a calcium ion-sequestering agent having a chelate stability constant log K ca of 5 to 13 at a ratio (d 1 /d 2 : weight ratio) of (d 1 ) to (d 2 ) of 98/2 to 50/50, when it forms a chelate in combination with a calcium ion.