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Hospital grade pumps are required to have a safety valve that does not allow milk to regurgitate (backflow) into the pump. Each patient has her own disposable kit, so that each kit is cleaned by that woman. These kits can be used multiple times by a woman, with cleanings after each use, but they can't be used by more than one woman. The only thing that is necessary to clean the pump is to wipe the pump off with the standard cleaning solution that the hospital provides for other multi-patient use equipment. This is a standard procedure in hospitals; you don't need to do any more cleaning beyond this.