The long-acting antibacterial film of Sir David is made of pure water and gaseous chlorine dioxide and then made by our company's patented technology (R.O.C. Patent No.: I 455869), which uses gaseous chlorine dioxide. The strong oxidizing ability destroys the cell membrane of prokaryotes and causes the metabolic function and protein on the cell membrane to be destroyed, thus losing the activity and causing the death of microorganisms. The product is soluble in water and can be quickly hydrolyzed. It has no secondary pollution to the environment and has the advantages of safety, sterilization, odor removal, long-term efficacy and convenience.