Patent ID: 8679366

Claim:
A cleaning composition comprising: at least one alkali metal hydroxide present in an amount from about 20% to about 70% by weight of the cleaning composition; water; 2-phosphonobutane-1,2,4-tricarboxylic acid or salts thereof present in an amount from about 0.5% to about 10% by weight of the cleaning composition; and a polysaccharide graft polymer composition present in an amount from about 1% to about 10% by weight of the cleaning composition, the polysaccharide graft polymer comprising: polysaccharide residue in an amount from approximately 5% to approximately 90% by weight of the polysaccharide graft polymer composition; and residue of at least one ethylenically unsaturated monomer present in an amount from approximately 10% to approximately 75% by weight of the polysaccharide graft polymer composition.