Teachers have the "germiest" jobs in America. Only one professional can do anything about getting rid of germs once they have infected buildings: the school custodian. Custodians should be the first line of defense against pathogens in schools. Unfortunately, most are not trained or equipped to deal with this invisible world. Facility maintenance managers face an additional hardship: they are expected to confront this greater risk of infectious disease as they deal with reduced budgets and cutbacks. Caught between these conflicting goals, how is a manager to cope? One way, which may appear counterintuitive, is to integrate measurement as part of the daily cleaning process. Measurement enables custodians to determine if they are cleaning the right things in the right way. It can provide evidence to concerned parents that the school is doing everything it can to keep kids safe. This article introduces integrated cleaning and measurement (ICM), an approach to cleaning that incorporates measurement as a cornerstone of the process. ICM can improve building operations and the health of students and teachers.