Method for treating textile product

A method for washing a textile product, comprising washing the textile product with a treatment liquid and thereafter rinsing the textile product with water, the treatment liquid being obtained by mixing the following components (a) and (b) with water containing a hardness component, provided that the treatment liquid does not include a total of 100 ppm or more of a dicarboxylic acid with 14 or more and 16 or less carbons and a salt thereof,

• component (a):
• a compound comprising a cation and bis-2-propylheptyl sulfosuccinate as an anion;
• and
• component (b):
• one or more surfactants selected from the following components (b1) and (b2),
• component (b1):
• at least one anionic surfactant (excluding component (a)) selected from the group consisting of:
• a sodium polyoxyalkylene alkyl ether sulfate,
• a (polyoxypropylene) polyoxyethylene lauryl ether sulfate sodium salt,
• a sodium alkylbenzene sulfonate, and
• an internal olefin sulfonate potassium salt, and
• component (b2):
• one or more nonionic surfactants selected from the group consisting of:
• a polyoxyethylene mixed-alkyl ether,
• a polyoxyethylene-polyoxypropylene-polyoxyethylene mixed-alkyl ether, and
• a polyoxypropylene-polyoxyethylene mixed-alkyl ether,
• wherein the treatment liquid satisfies at least one of the following requirements (1) and (2),
• requirement (1):
• a proportion of a content of the component (a) to a total content of the components (a) and (b1) in the treatment liquid is 2.5 mass % to 50 mass %, and
• requirement (2):
• a proportion of a content of the component (a) to a total content of the components (a) and (b2) in the treatment liquid is 10 mass % to 45 mass %.

A method for reducing foaming during treatment of a textile product, comprising treating with a treatment liquid obtained by mixing the following components (a) and (b) with water containing a hardness component, provided that the treatment liquid does not include a total of 100 ppm or more of a dicarboxylic acid with 14 or more and 16 or less carbons and a salt thereof,

• component (a):
• a compound comprising a cation and bis-2-propylheptyl sulfosuccinate as an anion;
• and
• component (b):
• one or more surfactants selected from the following components (b1) and (b2),
• component (b1):
• at least one anionic surfactant (excluding component (a)) selected from the group consisting of:
• a sodium polyoxyalkylene alkyl ether sulfate,
• a (polyoxypropylene) polyoxyethylene lauryl ether sulfate sodium salt,
• a sodium alkylbenzene sulfonate, and
• an internal olefin sulfonate potassium salt, and
• component (b2):
• one or more nonionic surfactants selected from the group consisting of:
• a polyoxyethylene mixed-alkyl ether,
• a polyoxyethylene-polyoxypropylene-polyoxyethylene mixed-alkyl ether, and
• a polyoxypropylene-polyoxyethylene mixed-alkyl ether,
• wherein the components (a) and (b) are used such that at least one of the following requirements (1) and (2) is satisfied,
• requirement (1):
• a proportion of a content of the component (a) to a total content of the components (a) and (b1) in the treatment liquid is 2.5 mass % to 50 mass %, and
• requirement (2):
• a proportion of a content of the component (a) to a total content of the components (a) and (b2) in the treatment liquid is 10 mass % to 45 mass %.