It is usually disinfected with iodophor first, and then with alcohol, for example, before surgery, it is usually disinfected with iodophor three times, and the disinfection range is reduced in turn, and then with alcohol, which is disinfected mainly along the surgical incision predicted before surgery. Nowadays, iodophor is very low irritation for human skin, so it is not necessary to deiodize with alcohol, and it can be left directly on the skin surface, and the iodophor will form an effective protective film that can avoid bacterial infection. If it is an ordinary wound, it can be disinfected simply with alcohol or iodophor. For patients who are more sensitive to pain, iodophor can be used for disinfection because iodophor is less irritating than alcohol.