A detergent comprising (A) a sulfobetaine type ampholytic surfactant, and (B) a quaternary ammonium cation-modified silicone. A mass ratio [(A)/(B)] of the component (A) to the component (B) is 0.1 or more and 1,000 or less.

A cleaning solution is a cleaning solution for an inkjet recording apparatus, including: water, a surfactant, two or more types of water-soluble organic solvents, and a carboxylic acid salt other than the surfactant. The two or more types of water-soluble organic solvents include at least polyethylene glycol. A Hansen solubility parameter distance between the polyethylene glycol and the carboxylic acid salt is 10 or less.

A cleaning solution is a cleaning solution for an inkjet recording apparatus, including: water, a surfactant, two or more types of water-soluble organic solvents, and a carboxylic acid salt other than the surfactant. The two or more types of water-soluble organic solvents include at least polyethylene glycol. A Hansen solubility parameter distance between the polyethylene glycol and the carboxylic acid salt is 10 or less.

A cleaning solution is a cleaning solution for an inkjet recording apparatus, including: water, a surfactant, a water-soluble organic solvent, and a polyacrylic acid salt. The polyacrylic acid salt has a molecular weight of 30000 or more and 200000 or less. The content of the polyacrylic acid salt in the cleaning solution is 1.0 mass % or more and 20.0 mass % or less.

A cleaning solution is a cleaning solution for an inkjet recording apparatus, including: water, a surfactant, a water-soluble organic solvent, and a polyacrylic acid salt. The polyacrylic acid salt has a molecular weight of 30000 or more and 200000 or less. The content of the polyacrylic acid salt in the cleaning solution is 1.0 mass % or more and 20.0 mass % or less.

A cleaning solution is a cleaning solution for cleaning an ink ejection surface of a recording head of an inkjet recording apparatus, including: water; a water-soluble organic solvent; an amphoteric surfactant having a betaine structure; a silicone surfactant; a nonionic surfactant other than the silicone surfactant; and an inorganic salt having a pH buffering effect. The cleaning solution has viscosity at 25 C. of 2.5 mPa.Math.s or less. The cleaning solution has a static surface tension of 25 mN/m or less. The cleaning solution has a pH of 8.0 or more and 9.5 or less after being sealed and allowed to stand at room temperature for one year.

A cleaning solution is a cleaning solution for cleaning an ink ejection surface of a recording head of an inkjet recording apparatus, including: water; a water-soluble organic solvent; an amphoteric surfactant having a betaine structure; a silicone surfactant; a nonionic surfactant other than the silicone surfactant; and an inorganic salt having a pH buffering effect. The cleaning solution has viscosity at 25 C. of 2.5 mPa.Math.s or less. The cleaning solution has a static surface tension of 25 mN/m or less. The cleaning solution has a pH of 8.0 or more and 9.5 or less after being sealed and allowed to stand at room temperature for one year.